This is a Battle.net question

At our household we have 3 World of Warcraft accounts, all used by different people. They are all tied to the same credit card however, and it's never been a problem. However this new Battle.net deal is making me seriously concerned. We have Blizzcon tickets and we'd ike to get our Grunty pets. However we'd all like to use our own Battle.net accounts if we do so. We're all still extremely unenthusiastic and dissatisfied with linking all of our current and future Blizzard games in one spot, considering if one gets hacked, they all get hacked. But that's another story. We're confused as to what to do, as we really do not wish to put the 3 accounts on different Battle.net accounts, ony to find out that some of the accounts will run into some sort of problem since they are all on one single household CC. I'm also pretty sure that there is little chance we will be swapping the accounts to different credit cards, as I am pretty sure there is a very specific reason we have them all on the same CC in the first place. I'm really hoping to be able to get some sort of answer to this ASAP, because we were already skeptical and unenthusiastic about the new Battle.net system as it was, and this is only making it worse.

I really don't like to respost, but this is a BATTLE.NET account merging question, not a Blizzcon question, and the original one should not have been moved.