Thanks for the insight into your system. Given that, I should definitely re-run the experiment when I can figure out how to get the MinnowBooster account to consistently sell its votes. It's currently set at 50% and still selling like 1 vote per day. Hopefully that will improve once the feed price catches up.
I suppose that would imply that you're doing a lot better for the buying customers than they are, although I think a bunch of that effect is that your algorithm batches votes together much better than theirs does.
Question - does your ROI calculation account for the portion of liquid payout that comes in Steem? That's beginning to have a significant effect these days.
I'm implementing that right now, but that will have an effect of the ROI for sellers as well