Equitable cosmetics, both from a quantity and quality standpoint, are achievable through in-game means.
I want to incentivize purchase in the cosmetic shop for sustainability of what expansions we have intended, since we are not a box cost. I want to incentivize purchase by offering limited items: limited time, limited quantity, so you have confidence that when you purchase them, they won't be offered later on in some other way. However, I want to make sure that equitable cosmetics both from a quantity and quality standpoint are achievable through in-game achievements. Time, effort should let you be happy with what you can accomplish. – Steven Sharif