I don't think they suck, in fact most are fed by real market data and can be very useful. But I never bring them up in negotiations. I would assume it would come off the wrong way and kind of sleazy (or pushy or something). Whenever someone does so to me, I typically throw it back at them and show a few other sources that disagree. But if it gets to that point there usually isn't any deal pending anyway.
I have Higgins (30 points) and a 2nd (5-10 points) worth about equal to Najee (37 points in my value system) but as I always say nothing happens in a vacuum and RB scarcity swings this one for me.
Fair take, both on the trade & on trade calcs. I don't bring them up during trade negotiations either, but occasionally trade partners will send me screen shots to assert that my offer isn't enough. Armed with the knowledge of what calc they're using, it makes it super easy to adjust the deal to the point that it's close on their calc.
Obviously one can be ridiculous and, as implied by some, offer 10x scrubs that add up to 1 star in a trade calc, but good luck not offending your trade partner that way. Being able to understand where the deal is off, and by how much, so I can counter-offer, has value. I usually counter by building on the offer I'd initially made. Sometimes the calc tells me I wont be able to get something done, because I don't value the players involved the same way that the trade calc my partner is using does.
But there's absolutely value in trade calcs. I tend to think of them as a communications tool. Back when I was a project manager professionally, one of the most frustrating things was having a peer in a different group who wasn't a trained PM. Because they weren't trained in the discipline, they didn't speak the same language, which made every aspect of working through the PM cycle more difficult. The same can be true in negotiations with a trade partner if each team manager values players wildly differently. I view calcs as a means to an end, not the definitive end-all be all bible of player value.
But like with your points system, it's a starting point to communicate how you value the player. If you came at me with a statement of "by my system, I have Najee as a 37, and Higgins as a 30" - I might not agree with you. But it gives me a perfect opportunity to either decide that you'll want too much for Najee compared to how I value Higgins, or to know that I need to come up with another piece to include to get it done.
Back to this deal, for my rebuilding team in a 12-team SF, I'm honestly not sure what I would do if someone offered me Najee for Higgins straight up. As I mentioned in my 1st response, I know Najee is worth more. But I also don't see Higgins as a WR2 on his team, but rather a 1B to Chase's 1A. It's a very pass-friendly offense with a very good QB, in an organization I see as on the rise. Pittsburgh feels like a rebuilding team that doesn't quite know that it's a rebuilding team. I hate their QB situation, and I don't love having good RBs on bad offenses. And I'm not completely convinced Harris is a really good RB, so much as he is a volume guy. Meaning, if the offense stinks with Trubusky and the volume isn't there, is Harris going to live up to that perceived 37 point valuation short-term? I assume the valuation takes age into consideration, but we see time and again teams with poor QB play hold back the offense, and RBs often have a shorter window than other positions.
So for me, personally, I might well decline such an offer. I'm sure everyone here will tell me I suck at FF for that opinion. Have at it. I'd rather have good players on good teams, if I have the choice. While it leans Najee, it's not so lopsided that it's a "godfather offer" for a player I personally really like. Sometimes liking the players on your roster has value too.
If I were in a 16 team league & hurting at RB while having good WR depth, my opinion would obviously be different.