Here's a possible solution, that may have loads of bad points, but I'm going to go for it anyway. What if you just allowed players to lose their points. The only catch being that once you were reduced to nothing, you could only play 50 pt (or less) PPSC games. If you lose a game that you put nothing into, you lose nothing. (And the other players gain points equal to what there would've been if you'd had the points.) If you win, you get what you win.
Maybe this "punishment" would only apply to WTA games. For instance: if Dan has 100 points, and he decides he wants to play a WTA game for 75 points, and winds up losing, he is reduced to 25 points. Now, he can play a PPSC game for 25 points, and if he loses that, have his 25 points reimbursed. Naturally, if he wins any of the above games (or draws, for that matter) then he gets what he would normally get.
Does this make sense? Does it even sound like a good idea?