Personally, I think the bid-bot owners should not allow bids that allow the ROI to go into the negative at all.
Basically, just close the round when the bot is full.
They are making a killing anyway, and this over-bidding is just more cream for them, and less for the guy at the bottom.
If I had the SP to run a bid-bot, I would implement this, and I would also follow @grumpycat's 3.5 day rule.
Bots not adhering to this (out of who's got the biggest balls more than anything else i can fathom), are 'endangering' their customers profits.
Cheers!
I wouldn't be opposed to closing before ROI goes negative or rejecting payments that cause the ROI to go negative, but I still think front-loading the power makes sense.
Its an option yeah, but perhaps trickier to implement? I think you'd have to come up with a plan for this... Maybe sending to 1 bot entitles you to a vote from 1 of 5, each with its own different SP total, and you get the vote from one of these depending on the timing of your send?
Definitely I think would be trickier to implement; however, the idea must come first for the change to happen.