Yep, definitely make sure you own all the accounts and they all have the same name/address/etc on them. Else, you'll just get temp banned until you go through a really long annoying process of faxing your contact info to Blizzard and waiting for them to update things.
I talked to 3 different GMs my first week alone, from being reported by various people. I'm still around, but strangely the guy who was cursing me in all caps in /say in the middle of IF has disappeared off my "friends" list... :whistling: