The inception of the idea for the dark squirrel came from me wanting to have something to spend hallowed marks on once you'd finished the dark graceful set and which would be both desirable enough that people would want it yet also completely optional so you didn't feel forced to do it. I figured that a pet recolour would be a good way to go about that.
I honestly wish every pet recolour we've ever pitched could have a matching piece of content you'd have to earn it from however the vast amount of pet recolour ideas outweighs the amount of content we can design for them so we end up with this inconsistency.
I honestly don't see it as an issue and I know many people support the expensive cost even if it is a little excessive in hindsight, at the very least we've sped up getting marks from initial release so it's not as bad as it was!