The issue isn't a lack of non-exclusive currency to try to justify the absurd price.
The issue is that the packs are arbitrarily inflated by using said non-exclusive currencies, forcing anyone who cares about the skins and other exclusives - which, let's be real, is the main reason the vast majority would buy the packs - to spend more money than a triple A game costs on 2 skins and a bunch of stuff they didn't want nor ask for.
If i just want the Frost skin, i shouldn't be forced to spend 60€+ because you are forcing me to purchase large amounts of Regal Aya and Platinum alongside both of the skins. Even forcing you to get either both skins or neither wouldn't be a huge deal, but this sort of arbitrary price inflation combined with FOMO is where it steps over a very clear line. At least with Prime Access accessories you know that they come back eventually for cheaper, while this is marketed as completely exclusive, so either dig deep into your wallet or get screwed, i guess.