Thanks to @yabapmatt this post gets my attention. I will try to explain why this is happening.
Bots with power more than 1 million have a problem with percent rounding. This is a steemit bug. In this case last bids from the current round get same pecent as others - 1% in the beginning but, in start of the round bot has 100% voting power so steemit round this to bigger upvote in the end of the round this 1 percent has less value because bot is not supposed to drop under 98% of voting power.
Some time bidders win more, sometimes lose in current case bot tracker shown - $5.78 upvote value and user gets - $5.75 pretty close.
Other user jins bid 3.4 and get 1.04% upvote ( 1.01% for sasho ) and steemit round this 1.04 to 1.5%.
Is a complicated but we cannot predict how steemit will round the percents and also depends on how much bids the round have.
I really read a fucking lot about paid upvote bots. But I never saw anyone mention this bug.
Sorry for my language, but I find it frustrating that there are so many scams and tricks to earn money. And now also a big which maybe could be used for personal benefits.
In essence I still think the steemit concept can really work and could be great.
I have a few questions, let me start with 3 of them, to keep this post a bit short.
1 are you the owner of @upme?
2 are they any publications about this bug?
3 your last sentence seems to indicate that this bug is a bit random. So do you think it is NOT possible to benefit from it?
I mean it looks kind of easy to do the math and always earn big.