There are huge costs that go into game development. The same publishers that sell AAA titles often also develop low tier games to try and find the next hit. They often lose money on those ventures. Focusing on the few games that "make it" does at all reflect the games market, which are full of lack-luster titled (in regards to sales) that simply don't pay the bills. Producers have to keep many games in development to keep the "next new thing" coming. Its a hedge against risk that pays off, yes. But is not as much as you think.
The term you're using, "designers" doesn't make much sense. The publishers are the ones who fund development houses to develop the game. Well known publishers are EA, Activision, etc. Those development houses do employ designers, but most are NOT millionaires, only those with a track record of designing popular titles get that kind of pay-offs.
As for GameStop they produce and develop nothing. They are simply the middle man in the process of selling media featuring profitable content from person to person.
As I mentioned in another post, if you get rid of the media, the largest factor on price will be the demand. When the demand drops, the price will drop as well. It will be a better result for the consumers.

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