I think setting up a recaptcha is enough to prevent from bot vote buying. If we can get upvote straight away, it is done and we don't need to try again and again. Lifting users from banning is necessary to maintain stability of minnowbooster.
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My suggestion is lower upvote value a little bit, currently MB is the best promotion service in Steemit So everyone want to use MB. And also reconsider about comment promotion becuase people are using comment promotion more than post promotion. Comment promotion is using the auto promote feature, if we can use this in post promotion there will less request to server.