The only reason I could see the mods blocking Zumzeros IP and NOT VE OR CRUMBS would be that they could clearly see that zumzero was obviously part of the scam which could have been given away by his IP address..
Yeah because we all know that Theymos takes a hard stance against scammers on bitcointalk. (Bitcoin Savings and Trust, Labcoin, etc...)
I am guessing Crumbs got a perma-ban but he uses proxies to get past it whereas other people don't care that much.