I believe they did make some changes in the distribution of the prize money a few years back, when Roger and Rafa were on the board.
Yes, they did. Of course that's also when Naal was lobbying for a 2-year ranking system and Roger was against it - and then Nadal whined that Roger was too Swiss and trying to please everybody...except HIM. And then Roger got asked about it at the AO in 2009 and he said he was against it because it would be fine for the top guys but make it too hard for lower ranked guys to move up the rankings and they'd need multiple big breakthroughs instead of just one.. I guess Nadal finally got over that ego trip of trying to protect his own ranking at the expense of lower-ranked players.