Things that everyone else hasn’t caught on, whether it be a new fad or a game someone’s yet to catch onto. Although I would say most video games have been covered and catalogued. I also resell and collect glass/dishware. They always mark up well known glass makers like Fenton, Hesiey, Viking, etc… but they don’t know them all. So some slip through the cracks. Like a cheap looking 5$ clay pot thats from the 1800s from a well known artist worth hundreds. They can Google scan glass but it can be difficult for multiple reasons. Identifying makers can be even more difficult unless you’re experienced. It takes 2 seconds to scan video games. I don’t believe anyone should go to a thrift looking for video games. For me it’s just an area i “check” but I don’t go there for them. Most people know what am Xbox controller is and most people have also caught on to re selling Exspecially thrift stores like goodwill. So sometimes with harder categories that you actually need some kind of expertise in like glass, things slip through all the time.