I absolutely feel like just about everything in the cash shop is overpriced, so I'll never buy anything from there. I would like to see the current price model fail and be replaced by a better one. The only way to have that happen is to not support the shop.
That said this:
doesn't really make sense. The items on the mogstation don't come from no where. They have to be created by SE. If they need to work to provide us with something it's fair for them to expect payment. Why single outfits or mounts cost half as much as a full game is a total mystery, but there's no reason to expect the devs to give out anything new that they create for free.
