This is an interesting question considering that there are 4 other players at the table that you consider better than yourself. Does one donator really offset the disadvantage you're at against the rest of the table?

I don't think it does because of the fact that you'd be playing in a more aggressive game against better opponents and for more money than you're comfortable with. Assuming that the rest of the table is composed of solid players, they're going to notice very quickly that your mark is a fish. They'll probably peg him as that even before he plays a hand since he's buying in for an odd amount. They're going to try and isolate him and you could very well find yourself caught in the middle.

HU or even 3-4 handed I would probably play. In a full 6-max table I don't think it's worth it.