Ok, so around a week ago I read somewhere that, all these new tribes are good for the Steem blockchain (which I wholeheartedly agree), and one of the reason said was, it curbs paid reach to the hot/trending tabs, which I do not agree).
Bot owners can simply buy those tribe tokens >> stake them and start selling votes.
People are on Steem for money and bid bots are here to stay. No matter what steem dev team does to curb this vote buying there will always be a workaround.
Vote selling is business for investors and for users it's good way to bring few eyes to their content (Better than sucking dicks of whales, eh?)
ps: this post is test for tipu's new feature: https://steemit.com/steemit/@tipu/tipu-voting-service-update-every-upvote-additional-7-tribes-token-rewards-and-counting