Your right I guess, I didn't think about that.
Having said that if I was going to donate that kind of money to something I'd probably just cut them a cheque rather than putting it through a website.
I doubt that's the explanation. But I don't doubt that either it's (a) astroturfing (fake), or (b) there really are a few people out there who are fans and have FU money to spend. (Think: FU money in the hands of successful techie biz owners, they do exist, and they have played computer games.)