I think it's already prevented. No high steem power will vote such a post when the exchange is a vote from lower steem power. Also it applies on high to high steem power upvotes exchange. Why would people with decent earning will exchange upvotes that will harm their status. No one wants to be banned when they can earn it without violating rules. There's no such method or way on cheating here. Well that's my point of view. Everyone has their own opinion. =)
RE: "Upvote my post and I'll upvote yours"
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"Upvote my post and I'll upvote yours"
You don't lose anything by upvoting, ever. The rewards you get come from newly minted steem. Also, you cannot be "banned" from steem, it's a distributed system. You can get banned from steemit.com, though.
After reading the whitepaper, I'm still not sure if this works or not, but time will tell. If it does, the devs need to be aware of it
Downvoting a post can decrease pending rewards and make it less visible. Common reasons:
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