Thanks man! When bid values exceed payout values (so a negative ROI for users) then instead of an arbitrage opportunity, bid bots will create a true market for promoting content. If users can only use bid bots at a loss, then every dollar spent on that promotion is presumably backed by content worthy of that promotion cost. Does that make sense?
Of course, as you mention, the down side is that the bid bot owners/delegators will be making an increasingly bigger ROI for doing basically nothing lol.
I think it would be a cool experiment for the community to publicly create a bid bot and burn the private key, and then the account just powers up all the bids, but essentially all STEEM/SBDs sent to that account would be powered up forever. So it's kinda like burning the STEEM, which would profit the whole community rather than a few individuals.