I'm with you guys here that this is a bad idea and will screw people over.
Luckily there is a local place that sells vintage gaming stuff along with current gen and makes a killing. Place is called Video Game Heaven. It started out as a booth at a flea market here that earned the woman shit loads of money. I know because i graduated with her spoiled asshole son. She paid for a 400-500k house pretty much in cash with the money that she made from that one location and a then new standalone. The flea market burned down a few years ago and she expanded the standalone store. You name it, they literally have it. I believe they do their own repairs on systems. Of course they sell the knock off NES/SNES/Genesis combos along with the original systems. Funny thing is is that her son is a total asshole and shes a really nice lady
Heres their FB page as their normal page looks like a thro back to 1999. Seriously take a look and drool at what they get in lol