I tried the upvote service. MinnowBooster was at about 39% vote power at the time I used it. I spent 2 SBD (about 1.96 USD right now) and got a author payout return of 75% x 2.42 = 7% loss. That is assuming no payout fade, so at 39% voting power this is a slight loss. Any idea what the break even voting power is so I can watch for that before using it?