For tributes, you get 75% of the $$. There's a disclaimer on it, saying that the tribute is a monetary gift/donation ONLY, no product guarantee.
I think that's to cover their own booty, like say you contact a performer and ask about a custom video and they say "yes if you pay for it up front" and then you tribute and then they for whatever reason DON'T pull through, c4s doesn't have to give it back, I think?