Well it should be pretty obvious by now that vote trading is nothing else than bid bot voting or whatever other scheme you can think of. If everyone votetraded so they all received 2x faster stake rather than just curation rewards and the odd posts others are supposed to curate, how do you think the platform would look like? Probably the same as what Steem looks like today. not to mention no newcomers receiving any curation but having to buy stake to participate, we could just turn into proof of stake at that point and remove post and curation rewards altogether cause who'd want to see placeholder posts in trending just so everyone could maintain max curation and max post rewards daily, something you and other votetraders are doing while everyone else is helping grow the ecosystem and value of your own investment.