With the N64, it helps if you can hook it up to a TV from around that era too. Games like Goldeneye look terrible on a modern LCD. I had that experience myself - “Man, I know I’m used to modern games now, but I don’t remember these games looking this shitty”. Then I dragged out my old CRT and hooked it up, and instantly it was “Now this is how I remember these games looking like”.

At best, I’ve seen a small discount and whatever is traded in is junked to keep it off the second-hand market.