You cannot abuse the Promote Function that is built into steem, regardless of how much money you have, because it's designed to be a net benefit, but when you buy what people give out for free, and help such a demand increase you're abusing the function of curation, which is supposed to reward people and not used for people to reward themselves, that is why we have a flagging function, when people vote themseves they deserve a counter flag and the line between a self-voting is thin, either you're doing it to move your comment up for visibility, or undo a flag that wasn't warranted, or you are doing it to pay yourself, and if everyone did that there wouldn't be any more sense to curation, it will only be voturbation. Vote selling, vote buying, and self-voting are all abusive, and many times it's as obvious as day and night, and if you're here primarily to make money or buy your friends and connections than you've missed the point of it IMO.