Nothing is 'the' problem, but we definitely should tweak a few smaller ones anyway, right? :D
But yeah, I honestly never have worried about the 'taxes' on voting, I just vote whenever I see something worthwhile, and am not too worries about the ROI I get. BUT for those that do, maybe something proposed as you describe makes them feel more clam/less inclined to 'chase optimal ROI' - and actually start manually curating instead of automating everything.
Thanks for adding your thoughts (and TIP! Thanks!), I didn't even take the 'taxes' and curves into account while writing this post, that's how much they're off my radar :D