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Huh, it looks like my code double-counted some transfers that got refunded. Let me check that out.
And yes- they get negative ROI but they also secure a spot on Trending. If a user overpays for a vote, they also make it harder for every other author who paid SBD to gain publicity.

I was wondering why some people send bids to the bots even when showing a negative ROI. But I guess they see it as a potential bump to the trending page as you mentioned. For example @gmichelbkk spend $464.88 to receive $67.10.

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