Just because they're giving them 2x rewards based on the value of the hive they purchased the votes for doesn't change much, if that's what you're implying to with the curaton rewards. They're still voting based on who's paying, not things curators look to reward and direct inflation to.
I just stumbled upon a post @vempromundo going over the HSBI project and the fact they hadn't upvoted the post just cause (what I assume) the author doesn't have units or has purchased votes kind of proves my point of what's wrong with these schemes. It's a little sad to say the least that the creator consumed and left a response but didn't reward a post literally talking about his own project with a vote.
I don't want people to read too into this example but if all we vote is just whoever gives us money I don't think I need to remind people of how that went a few years ago.