I'm no longer playing WoW, but, mostly, only gold sellers. I might put a guy on quanrantene for a couple of days, but i normally remove them from the list after a couple of days.
I sometimes still play with a trial acc, and on that acc i normally ignore all guild spamers, just because they normally use ad-ons that keep spaming guildless people... And its so freaking annoying being spamed by the same dude every freaking hour (i even explained him i was on a trial acc, and he keeps spaming... i just had to block him, on all my toons on that acc).