Ah, a new monetization technique :-)
Well, not really new. A lot of MMORGS will allow extensive plastic surgery for your character, often once for free and then for a fee.
An interesting side-note is that some (typically Asian) games have gender-locked classes. There is usually some whining about it, but not that much.
I can imagine the whining, though, if there were gender choice but your account was locked to a random class.
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