I completely disagree with him. Selling votes is just like passive income it benefits both the seller and buyer.
Now-a-days in steemit it has become hard to come into limelight or attract people by your posts.
People comment or upvote you posts only if you have good repo( Not everyone)
In that case one buy votes until he gets 50 to 60 rep or even after that.
Moreover everyone wants the longterm benefits and thats why we are working hard on steemit.
There might be a situation where you can't make daily posts but your steempower is high. I'll bet that no one want their hard work go in vain. They could sell their votes and earn from them.
Mentioning selling votes as prostitution is absurd. Smartwork and illegal work are entirely different.