I feel like they're actually three of the more reasonably priced items available on the Mog Station. I, personally, don't mind throwing money at Square Enix when it comes to cosmetics - it's unfortunate but in today's gaming world it's pretty much standard to have to do as much if you're a collector. I was actually expecting them to show up as part of the upcoming soundtrack.

I do think it'd be preferable for them to have been tied to achievement points, though. Especially since we ended up getting a revamp of the achievement point system recently...