Still, if people /ignore spammers, spammers get sadface, then stop it (sometimes), then if they don't stop they go in world chat, and then they get muted/banned. So it has a way of working itself out, just requires people to not be lazy and start the process.
PS: Realized now (had a rough week, grandma died, longass flights home and back) that I was kinda douchey sounding, so I apologize. But yea, my less douchey reply is above