The league I play in last 7 years:
2008: 6 team playoff 1&2 bye week 1
Team #3 wins, #1 team finished #2, #2 finished #4
2007: 8 team playoff no byes
Team #8 wins, #1 and #2 eliminated first week
2006: 8 team playoff no byes
Team #5 wins, #1 finished #8, #2 finished #2
2005: 4 team playoff no byes
Team #4 wins, #1 finished #3, #2 finished #2
2004: 8 team playoff no byes
Team #1 wins, #2 finished #3
2003: 8 team playoff no byes
Team #1 wins, #2 finished #2
2002: 8 team playoff no byes
Team #3 wins, #1 finished #4, #2 finished #7
I think the best saying about fantasy football is that it takes skill to make it to the playoffs, and it takes luck to win the playoffs. You can make percentages for anything, but I think winning the playoffs is a matter of luck. With the exception of a 1st week bye, everyone has the same amount of chances of winning the league once in the playoffs.