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The green highlights are always near the top. They are those bidbots with less than 10 minutes remaining that still have a positive ROI - so worth bidding on, so long as it is less than the Max Suggested Bid.

thank you! less than 10 min to the end of a bidding cycle, right?

Yes, and still positive ROI, even if small. A green bidbot will turn back to normal if there are bids during that 10 minute period that result in the Max Suggested Bid = 0.00.

pure and simple. thanks!!