@Pyrosa: I agree that they do that not to earn money, but to prevent abuse, but still interested in the number, as I feel it's quite a nice round number for them.
First, it's $10, not $5. Second, what 5K users are you talking about? Their active XBL base is over 50 million users, you seriously think that only 0.01% of that base change their name each year?
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