In Nate Silver's chapter, Is Alex Rodriguez Overpaid? from Baseball Between the Numbers he did regression analysis to determine the magrinal economic value of 1 additional win. The value was approximately linear between 60 and 84 wins and 94+ at $750K. Wins increased in value by roughly $750K until the 89th win, which was the most valuable at $4.5M. I currently project the Twins as an 88 win team. So as long as we don't pay more than $4.5M/win the players salary should be paid for by increased revenue. The 2 biggest issues with this study are that it's from 2005 and based on WARP1.