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I have an alt that I'm using to eval the SYV service as a vote seller. I tend towards the view that upvote services are to get minnows established until they find their audience. So I think that weening authors off upvote services as their posts begin to earn regular rewards is a good thing. That's one of the reasons why I probably won't powerup an account to service the mid-range vote.
However, I suspect (not that I deign to read @reggaemuffin 's genius mind) that SYF might soon have mid range votes filled by multiple external sellers. I think this will solve another problem with a glut of lower value SYF suppliers: if they were combined they could help service the mid-range and thus get more reliable income. RM already moves at breakneck speed and I like how he incrementally improves MB by having many smaller rollouts of new features.
Disc: I have no inside knowledge of MB. Wild speculation only.

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Just as a side note. The chart with 'minnowbooster income' is probably misleading, as it counts what the minnowbooster account owns. And that account is the combination of all users balance and all vote earnings. So when a user sell votes but waits with paying out, you probably count it as mb income.

And the rest is 90% investor income, 10% mb income. If you graph the real payouts: from mb to other accounts,then the picture could be different. 🐐

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Well, if a user sends 500sbd to his minnowbooster balance then that is totally unrelated to voting but could be something integrated in the chart.

Then again your new post factors this in with the use of our api 😊