If there is a shop inside the game like in Assasins Creed(Specific Origins and Oddysey part) where you can buy itmes that will really affect your game process like will give a damage buff,more health,armor and also a lot of times the free armors in game look like shit,but in the shop there are a lot of cool cosmetics,which means that devs can do cool cosmetics but only for real money.
Upd : Also skins,idk why but nowadays other players dont care about ur skills but about how u look in the game,even if u have a golden skin or the most expensive one,but no skill players will still respect u more than others.