Stuff being wildly lucrative isn’t necessarily a great benchmark. On paper at least Axie has been wildly lucrative. Being wildly lucrative for some people who can pay their rent doesn’t make it moral either. As my sibling comment notes there’s also no free lunch and the lucrative for some people part has negatives for the rest of the player base.

That said I have nothing against player made cosmetics being sold but there are much more obviously equitable ways of doing that.

And then the elephant in the room that cosmetics are not game affecting and there is utterly no reason to use a blockchain for any of this.