Don't you think, theymos and moderators, that it's about time to massively ban all this guy's alts?
The Mods are not certainly gods with some sort of superpowers unless if they have access to more details such as IP addresses but even then people like Polo7 never give up that easily, they will try to use different IP addresses, User agents etc via browsers like Tor
So the only way you can make them ban such alts is by making a well documented thread about the alts and then making a report to the moderators