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I upvoted him via the minnowbooster sell your vote program.. Not proud :(

I see no option to do that on Minnowbooster.

You don't know it? On minnowbooster.net you have to go to My Account > Edit Info, there you can activate voteselling and set a Votepower threshold when to sell your vote.
When people buy a minnowbooster upvote and minnowbooster can't fill it itself you get the paid sbd and vote instead of minnowbooster.

I see, good way to ruin the comment section. Minnowbooster just further ruined their reputation.

I didn't know, that comments where also allowed on minnowbooster.. I set the vp threshold now to 95% to just use up the votepower that would get wasted otherwise

Thant's funny I don't use minnowbooster fo that sorta thing. I'm not even sure what it does. but I do match upvotes for myself while i have Delegation.