As far as I know, and TT and I have asked many people about this,
If they ban one account for scripting, they will NOT ban the other accounts. A good friend of ours used to have one account on a one week ban all the time and would play the others no problem. We asked about the credit card thing, and he said they all went to one account.
so, long explanation short, I don't think so. All of our accounts (5 of them) go on one credit card.