I've been looking at the IPs and trying to squash them- there's been some that were screened without anyone ever seeing them. Sadly, it's impossible to ban IP addresses, especially since vpns can be used. All we can do is try to screen them and keep them from getting the attention they so desperately crave.

edit: It IS the same person in some cases, but different folks/vpn users in other cases. (Yes, it's easy to tell if you're a dumb ass about it).