Well, I just tried to give some money to PPRuNe, but it's not very easy.
(1) I tried buying a personal title, but got stuck at the point where I had to give the same email address I gave when registering. I haven't a clue what that was! - I usually make up different email addresses for each site I regsiter at, but I never bother to write them down. (Although if I were less lazy I could poke around and see if it's in an email somewhere.)
(2) I considered buying one of those badges that was being sold a while back, but can't find out how to.
So I have failed to give PPRuNe any money today.