@gamingonlinux
I think it depends on the game.
Especially for online games it can be:
I played this game for 500h+ so paying a little more and showing your appreciation for the game development through a skin.
Also it's nice to have some change in your game if you play it for 500h+ hours.

I don't understand it for single player games, but no one looses anything if it's just a visual instead of actual gameplay being paywalled.
Additionally game developers being heavily underpaid.