You'd be surprised the actual costs it takes to hire good 3D modelers and pay them for their time, it's hardly "little cost to make that one mount."

Like all companies, they figure out the costs of R&Ding stuff, price it accordingly based on analytics & statistics and then rake in the money. Based on how I saw everyone and their grandma having a fat cat when they first came out (Almost every mount sees giant swaths of players purchasing them) I think they've found their target price vs potential buyers to maximize their profit.

At the end of the day, people have very different ideas of whats a good price and whats not. That fat cast cost me like maybe 2-3 days worth of coffee + breakfast, which was pretty easy to skip breakfast to put that money towards a highly adorable mount instead. Vote with your wallet; yet the $24.99 price point has already shown giant success if they make the mount appealing enough, so at the end of the day it's up to you to decide if its worth it or not.