It would work like a 0% upvote.
He'd upvote but it wouldn't change the value.
If he'd upvote with 90$, the one with 90$ would receive a part of his back.

But, as another user mentioned, this system still needs to be adapted, to, for example allow space for curation.

I think a solution would be calculating a "mean-value" of the existing, and allowing to go up to this to avoid 0% votes, to guarantee curation.