Why I'm not surprised. You get remodeled drake mount with extra horns from raids ("free" content) and then you have this great looking mount with unique animation from shop for 20e. Now I wonder which of those required more time to model and make..
Although let's face it folks. We're going to see 80 reskins of this mount all through MOP so if you don't want to buy one or can't justify it.... just give it time. You'll probably be able to get a Jade-green one and a Ruby Red one from some sort of MOP reputation grind at level 90 like with Ramkahen.