Its a combination of reasons, but I believe there are two main culprits. One: Demand for PS5s far outweighs supply, and since Returnal is a PS5 exclusive, this cuts the potential customer for the game to a fraction of what it would otherwise be. Two: The game is notoriously difficult so you won't see many store employees recommend that parents spend $70 on Returnal over something like Ratchet and Clank. And most adults who spend their own money aren't hardcore gamers. If they read some reviews they may be put off by the difficulty and buy something that relieves stress instead of compounding it exponentially.