Not sure, but it was the vote by blocktrades that brought up the value of the Return Proposal so radically. It's a 26.5 million HP vote.
Could be it's time for a change to enable "percentage" proposal voting, just like we don't have to vote on posts with 100%.
I agree with percentage vote for proposal voting or even having multiple tiers of return proposals. I've heard that mentioned too.
I thought that @blocktrades was always voting the return proposal though. He's also voting for a lot of the other proposals too.