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the ROI is somewhat guaranteed (not in usd, but STU) if you purchase votes. Not if you use the bidbot, but if you buy individual votes from the system.

Agreed. But it is normal that the ROI can be somewhat neutral, slightly negative if the market is really bad. But that is something nobody can predict, which means 10% or 15% is simply a buffer. Imagine how bad it is if a bid-bot vote of -10% have been bought and then the market tanks..

On the other hand, if the market is somewhat sidelined or positive, it can easily be very profitable.

Are you the maker of this service? I have lost 56 steem to this service, I was trying to promote a friend 16 hours ago Transfer 56.000 STEEM to smartmarket https://steemit.com/freedom/@shepz1/i-set-off-to-see-the-world-and-i-did-not-like-what-i-left-behind