Very good initiative!
4 days ago i add my first post on SportsTalkSocial: NBA Loyalty and how it Completely lost it's Value! (i did not add a link because i did not want to be consider as spam)... and i worked on this post couple of good hours and did not receive not even one vote. Anyway i don't understand how those posts can get votes?!?
I think the idea of ban a user completely from the site is an excellent one... and it will be very beneficiary in the long run!