RE: Don't use vote-selling bots: use @promoted instead. A bot that upvotes you when you burn money!
This is an interesting idea. I don't like promoting myself, it makes me feel weird, and I don't like the idea of buying votes either but I might give this a shot at some point.
Although, having said that I don't think I ever look at the promoted page and I doubt I'm the only one that doesn't look at it either, so promoting a post might end up being a bit of a waste, I don't know.