Re: "we have run tests by putting skins on sale in the store" - where & when?!
@SlivPTS so you say they made tests directly on people's wallets? like setting a skin 20 now, 10 the next day, 15 the third one and so on, to see where the right price point is? I doubt if it's even legal to do it like that in a game, although I've seen a store that adjusts prices based on demand, they start with a huge discount and then rise back towards the full price by a certain step, after each batch of 100 or so items get sold, even if that happens in an hour.
Yes, the skins are more work for artists and can't cause more issues and slower fixing directly. But maybe they don't have the possibility to double or triple the number of skins released per month, so they would have to come up with other type of content to justify buying battle passes or special event chests. New legends, items, map areas, modes and animations can cause more issues and slower fixing.