Even then, it's rare, if ever, that he mentions prices on anything unless its really rare.
That seems to be the story for the NES though, a lot of the super-rare, uber-sought after games are horrendous in quality. There's a reason why there weren't so many of them out there. When I was just getting into retro gaming and buying large lots of games, I had a loose cart of color-a-dinosaur. I played it for 5 minutes and sold it off on craigslist. Someone offered me $15 for it and I didnt do research beforehand to see why this shitty game was going for that much, so I sold it.