It probably won't have much effect (though still a little) on larger payouts including most paid votes.
This is the primary point I was trying to make. As for the 'tip' of the curve... using this curve from @vandeberg's post, the point I marked in red was the point I was thinking of...
While the curve itself is gradual, this is the vote level where rewards with n^2 and linear cross. I don't know what his scale is, but if the 0.5 shown represents a STEEM value of vote, then I think it's way too high.
