You'd better read the specifications for Yahoo's Big Board:
The Big Board takes into consideration past returns, current performance and expected future gains in determining who should be included among the top 50 fantasy baseball players. Essentially, the Big Board is a cheat sheet designed for a fantasy owner who is planning to participate in a draft today. Yahoo! Sports Fantasy Baseball default scoring settings are used as the baseline for the Big Board, which is updated on a weekly basis.
Thus, the Big Board, IMO, is more of a "2005 culmination" than a preview for 2006, because it includes past returns. Yes, past returns does contribute to expected future gains, but notice how they explicitly separated them in the above paragraph. So, they are not making these to predict future gains for next year only...and they are not completely a 2006 ranking system.