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What about getting the original account banned after the character has been transfered using an out of date hack or similar.
It's just when buying an account it's hard to put any time into it as you've always got a voice in your head saying you could log in tomorrow and it'd be gone.
Has anyone tried this?
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This is a tried and true method to make a character recall-proof.
Although, it isn't 100% foolproof. Nothing is.
If the person is clever enough to know what to say to Blizzard, he can:
A. Get the account unbanned. He can say it was hacked and come up with an extremely complicated story.
B. Call Billing and recall the account.
C. Fill out an unauthorized character transfer form to reverse the transfer.
Although, if Blizzard sees suspicious things like constant information changes (email, phone number, etc.), they may decide not to unban it.
And if it does get unbanned, they may not reverse the transfer by concluding that the guy did share his account info.
It depends a lot on luck, but it can be done.
Otherwise, if the guy really doesn't know how to get an account unbanned, it's a great method to recall proof the char.