I’m gonna call bull on this. All of these prices are eBay ‘Buy It Now’ listings, which are listings that people are asking for, but don’t necessarily sell. Anyone can ask for $500 for a Klondike Bar if they want. Also, most of these are for brand new (sealed) items. Gameboys are only really worth about $20-$25, the K’nex set is only worth $75, and Sega Genesis systems are only worth about $30.