I don't use the RMAH, but the fact that if you don't specify that you want the money transfered out at the time you post the auction, it is forever stuck in you battle.net wallet (or whatever it's called) makes me wonder.
Let's say you sold $5000 worth of virtual goods and there is not $5000 worth of goods you can use it for from Blizzard.
What then if you have no way of retrieving your money? Once someone payed you for the item (minus fees), it's technically your money.
That has to be walking a fine line on what's legal in the U.S.
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