They are not required to be gamers. Having said that, my GameStop employees are definitely gamers.
No wonder people have such bad experiences in GameStop.
No. The major problem is people getting made over trade-ins. That has nothing to do with the employees being gamers or not. If I go into a movie rental place and ask the employee if they're a movie buff and they say no, my experience with renting a movie will not change at all.