Do we know what percentages in other major sports the players get from the total? I would love to compare them to tennis, because that 15-20% seems ridiculously low, isn't it?
the real percentages in slams are higher, at least if you include the female players, from what I've read.
Besides, what should be measured is the % of the profit, not of the total revenue.
Finally, I'm not against the idea that slams would give money to the more global organization of tennis, not just to "Stakhovsky's bigger flat" or "the Bryans' pool". But of course if the national federations keep that only for themselves to be "rich federations with a lot of infrastructures" and it doesn't benefit the other federations ... I would like the money to be internationally spread by the ITF as it's international tournaments.