Quoted from CaptainNeo:because the add ons don't justify the costs. You really don't get a whole hell of a lot for the extra 2k. Many games are like this. There are a ton of games where you can get away with the pro and not really miss out on anything. And some games like MET. the pro is better because they have some large ass object in your way.
I started buying Pros because of cost and a lot of time the features don’t work well on the premium games compared to the pro.