Increase the quality and length of post discussion
How would the monetary aspect have an impact on the length of a thread?
People that give themselves a self-vote in the comments section of one of my articles, usually won't be upvoted by myself which means that they lose up to $1.00 which is currently equivalent to my 100% vote. I also explain my decision to them like "I won't upvote your comment because you already did.". That's my way of showing people different options and teaching them to be more pro-community. I think that's much better than completely banning the self-vote-option.
Many people right now just make comments so they can vote for them, not to add value to the thread. When you take this option away, it makes contributing to the thread the only reason for posting.