OK, start with this mentality - 2 RBs for $13/each are better than 1 RB at $26. And so on .... You want protection from injuries, and byes, and your RB getting the flu on Sunday, or being game-planned into a single digit score, or being ejected during the game, or his team fighting from behind with the passing game, or ...... then better to have a next man up mentality.
But if you use this mentality, you can then say it's better to roster 4 RB's for $6.50 each, or 8 RB's for $3.25 each. Next thing you know, you have a roster of $1 scrubs.
There are obvious limits. I see teams going into battle with only 4 RBs. Won't last by a long shot. If we were allowed more than 30 players, for $85 spent on your running back group, I'd rather have 14 each of $6 RBs than just 4 RBs averaging $21. Ever heard about too many eggs in one basket? Same applies to the other groups (WR, TE, K, D).
The hardest position for cheap players to make a difference is RB. Here are the top 20 scorers at each position from last year:
QB - 47 offered - bolded the 5 "best" deals. I defined "best" by expense minus overall finish (i.e. Baker Mayfield is 20 - 3 = 17)
1 - Lamar Jackson - $24 - 4th most expensive
2 - Joe Burrow - $22 - 7th most expensive
3 - Baker Mayfield - $14 - 20th most expensive
4 - Josh Allen - $27 - 1st most expensive (tied)
5 - Jayden Daniels - $17 - 14th most expensive (tied)
6 - Jared Goff - $18 - 11th most expensive (tied)
7 - Sam Darnold - $9 - 31st most expensive (tied)
8 - Jalen Hurts - $27 - 1st most expensive (tied)
9 - Patrick Mahomes - $27 - 1st most expensive (tied)
10 - Bo Nix - $11 - 26th most expensive (tied)
11 - Brock Purdy - $18 - 11th most expensive (tied)
12 - Kyler Murray - $20 - 9th most expensive
13 - Justin Herbert - $16 - 16th most expensive (tied)
14 - Geno Smith - $12 - 22nd most expensive (tied)
15 - Aaron Rodgers - $16 - 16th most expensive (tied)
16 - Caleb Williams - $16 - 16th most expensive (tied)
17 - Jordan Love - $21 - 8th most expensive
18 - CJ Stroud - $23 - 5th most expensive (tied)
19 - Matthew Stafford - $13 - 21st most expensive
20 - Kirk Cousins - $15 - 19th most expensive
RB - 91 offered - bolded the 5 "best" deals
1 - Saquon Barkley - $29 - 4th most expensive
2 - Derrick Henry - $26 - 10th most expensive
3 - Jahmyr Gibbs - $28 - 5th most expensive (tied)
4 - Bijan Robinson - $33 - 2nd most expensive (tied)
5 - Josh Jacobs - $23 - 13th most expensive (tied)
6 - Kyren Williams - $27 - 7th most expensive (tied)
7 - De'Von Achane - $21 - 16th most expensive
8 - James Cook - $24 - 12th most expensive
9 - Alvin Kamara - $23 - 13th most expensive (tied)
10 - James Conner - $17 - 23rd most expensive (tied)
11 - Chase Brown - $13 - 34th most expensive (tied)
12 - Chuba Hubbard - $12 - 38th most expensive (tied)
13 - Joe Mixon - $22 - 15th most expensive
14 - Jonathan Taylor - $28 - 5th most expensive (tied)
15 - Aaron Jones - $19 - 18th most expensive (tied)
16 - Bucky Irving - $5 - 64th most expensive (tied)
17 - David Montgomery - $19 - 18th most expensive (tied)
18 - Breece Hall - $33 - 2nd most expensive (tied)
19 - Rachaad White - $27 - 7th most expensive (tied)
20 - D'Andre Swift - $17 - 23rd most expensive (tied)
WR - 116 offered - bolded the 5 "best" deals
1 - Ja'Marr Chase - $35 - 4th most expensive
2 - Justin Jefferson - $36 - 3rd most expensive
3 - Amon-Ra St. Brown - $34 - 5th most expensive (tied)
4 - CeeDee Lamb - $38 - 1st most expensive
5 - Brian Thomas Jr. - $13 - 43rd most expensive (tied)
6 - Malik Nabers - $19 - 27th most expensive (tied)
7 - Terry McLaurin - $19 - 27th most expensive (tied)
8 - Jaxon Smith-Njigba - $15 - 37th most expensive
9 - Garrett Wilson - $32 - 6th most expensive (tied)
10 - Drake London - $30 - 9th most expensive (tied)
11 - Jerry Jeudy - $12 - 50th most expensive (tied)
12 - Ladd McConkey - $14 - 40th most expensive (tied)
13 - Mike Evans - $29 - 12th most expensive
14 - Courtland Sutton - $13 - 43rd most expensive (tied)
15 - Davante Adams - $30 - 9th most expensive (tied)
16 - AJ Brown - $32 - 6th most expensive (tied)
17 - Tee Higgins - $19 - 27th most expensive (tied)
18 - Tyreek Hill - $37 - 2nd most expensive
19 - DJ Moore - $22 - 20th most expensive
20 - Jordan Addison - $14 - 40th most expensive (tied)
TE - 49 offered - bolded the 5 "best" deals
1 - Brock Bowers - $14 - 10th most expensive
2 - Trey McBride - $24 - 3rd most expensive
3 - George Kittle - $15 - 9th most expensive
4 - Travis Kelce - $30 - 1st most expensive (tied)
5 - Jonnu Smith - $8 - 23rd most expensive (tied)
6 - Mark Andrews - $23 - 4th most expensive
7 - Zach Ertz - $8 - 23rd most expensive (tied)
8 - Sam LaPorta - $30 - 1st most expensive (tied)
9 - Tucker Kraft - $7 - 28th most expensive (tied)
10 - Hunter Henry - $9 - 18th most expensive (tied)
11 - Pat Freiermuth - $10 - 16th most expensive (tied)
12 - David Njoku - $14 - 10th most expensive (tied)
13 - Cade Otton - $8 - 23rd most expensive (tied)
14 - Mike Gesicki - $7 - 28th most expensive (tied)
15 - Kyle Pitts - $17 - 7th most expensive (tied)
16 - Chig Okonkwo - $9 - 18th most expensive (tied)
17 - Cole Kmet - $14 - 10th most expensive (tied)
18 - Isaiah Likely - $9 - 18th most expensive (tied)
19 - Dalton Schultz - $12 - 15th most expensive
20 - Tyler Conklin - $10 - 16th most expensive (tied)
PK - 32 offered - bolded the 5 "best" deals
1 - Chris Boswell - $4 - 13th most expensive (tied)
2 - Brandon Aubrey - $8 - 1st most expensive
3 - Ka'imi Fairbairn - $6 - 5th most expensive (tied)
4 - Cameron Dicker - $4 - 13th most expensive (tied)
5 - Chase McLaughlin - $4 - 13th most expensive (tied)
6 - Jake Bates - $3 - 26th most expensive (tied)
7 - Jason Sanders - $5 - 11th most expensive (tied)
8 - Wil Lutz - $4 - 13th most expensive (tied)
9 - Daniel Carlson - $4 - 13th most expensive (tied)
10 - Jake Elliott - $6 - 5th most expensive (tied)
11 - Tyler Bass - $6 - 5th most expensive (tied)
12 - Matt Gay - $7 - 2nd most expensive (tied)
13 - Justin Tucker - $7 - 2nd most expensive (tied)
14 - Jason Myers - $6 - 5th most expensive (tied)
15 - Joshua Karty - $3 - 26th most expensive (tied)
16 - Younghoe Koo - $6 - 5th most expensive (tied)
17 - Blake Grupe - $4 - 13th most expensive (tied)
18 - Will Reichard - $3 - 26th most expensive (tied)
19 - Cam Little - $3 - 26th most expensive (tied)
20 - Jake Moody - $6 - 5th most expensive (tied)
TD - 32 offered - bolded the 5 "best" deals
1 - DEN - $3 - 23rd most expensive (tied)
2 - MIN - $4 - 16th most expensive (tied)
3 - BUF - $6 - 6th most expensive (tied)
4 - HOU - $5 - 10th most expensive (tied)
5 - DAL - $7 - 1st most expensive (tied)
6 - PIT - $6 - 6th most expensive (tied)
7 - GB - $3 - 23rd most expensive (tied)
8 - SEA - $4 - 16th most expensive (tied)
9 - CIN - $5 - 10th most expensive (tied)
10 - PHI - $5 - 10th most expensive (tied)
11 - DET - $4 - 16th most expensive (tied)
12 - LAR - $3 - 23rd most expensive (tied)
13 - LAC - $3 - 23rd most expensive (tied)
14 - ATL - $3 - 23rd most expensive (tied)
15 - IND - $5 - 10th most expensive (tied)
15 - BAL - $7 - 1st most expensive (tied)
17 - CHI - $5 - 10th most expensive (tied)
18 - TB - $4 - 16th most expensive (tied)
19 - KC - $6 - 6th most expensive (tied)
20 - WAS - $3 - 23rd most expensive (tied)
As you see above, only 3 of the top 20 RB's were priced under $17, and the 20th highest scoring RB scored only 179 points. There were 35 WR's to score at least 180 points, and 14 of them were $16 and under. My whole point for doing this is to show you can't win with bargain basement RB's, but you can with every other position. I'm not saying you should totally avoid the cheap RB's, but you simply can't survive with a bunch of RB's $13 and under. Just look at the current top 20 RB's after 4 weeks - 15 of them are $20 and over, 3 are $16-$18, and the 2 outliers are $13 (Javonte Williams at RB6) and $8 (Kenneth Gainwell at RB20). A grand total of 1 entry chose both Javonte Williams and Kenneth Gainwell.