Spammers are usually cycling through accounts rapidly. If they pay, that gets a lot harder. You’d still enforce against spammers who pay the $8, but the requirement to pay will reduce the volume and make the problem more manageable.
I guess it depends on what your definition of spam is. I think it people are paying to be promoted then it is the same as an ad, and to me ads are a form of spam if I don't want to see them.
