@pharesim considering how rewards are calculated, the more expensive STEEM becomes, the less SP is generated as reward. Therefore, the biggest ROI needed to make profit. Bid-based bots get disadvantageous already, because of the sheer quantity of mindless bids by those who can't into math. And to get by with just self-votes one should invest a lot. I dunno, this amount of money can make money in plenty of other ways, without risk of being busted by @cheetah of @steemcleaners