I picked up some old Atari 2600 and NES carts today from a 2nd hand shop. I bought a lot of 25 carts (19 Atari, 6 NES) for next to nothing. I don't expect them to be worth much, but after checking eBay, I stand to make a small profit. One auction left me puzzled, NES Duck Hunt rare 5 screw cart 1st edition. I thought this was the most common NES game ever. I assume it's another case of "everything on eBay is rare".
Is there any truth to what he is saying, are 5 screw version carts any more collectable than regular 3 screw versions. I also picked up a 5 screw version of Gyromite...