longisland, the cartmanager system does not really "link" with EBAY, they just get permission to access it to glean the information at the end of the auctions in order to send out invoices. And Google itself does not link to EBAY @ all.
I have several GC accounts, so when my last EBAY account got suspended, which was a while ago, I just started using a different GC for EBAY. But if you want to go through the effort you can just change the email address and the name that the customers see on the invoices and credit card statements, and use the same GC account. | 
