Right. And exactly how many people is "They". Overall if we have no numbers this is just a needle in a haystack. You nor i have any actual knowledge on who's "Desperate" and who bought both costume sets. However going off the fact that Fantasia is #1 in the mogstation means people change a lot. And that doesn't mean they bought both costume sets because they could change race only and not gender. So your counter-argument is like trying to grab air.
Also if enough people want the same thing to be changed, it will be changed.