Actually when I had a summer job at Game (12 years ago now), there was a brand new Dreamcast pod in the store. There was a kid who would come in everyday, presumably he bunked off school because it wasn't holidays, he would then spend the entire day on the machine.
Nobody else could ever get on the thing to try it, as sales assistants we didn't really have the authority to remove him, only the Manger was allowed to kick him out. After the Manager removed him, he would always just come back when he wasn't around.
Eventually we moved the pod further to the back of the store, then one day we saw him walk in, heading towards it, the Manager headed him off just before he got to it, swiftly walking past and switching it off! The kid just didn't know what to do then, I watched on the CCTV behind the counter that he was just stood staring at the wall of games at the back of the store.
You do get some proper weirdos in retail, so perhaps this charging method is just trying to stop people hogging it, when they probably don't have staff to monitor it all day.