I dunno, man. I can't think of any game that I would pay that much for. I guess it's all relative, though. I could maybe see spending like $400 for one of those NG:Dev Neo-Geo homebrews, but that would be my absolute top end. And I don't want to sound like a prick, but I feel pretty confident saying that I have more disposable income than the dude in that YouTube video.
I have two games that I paid about $100 each for, and those are my most valuable. I just can't fathom spending $3k for a game that I can play for free on a flash card. The two spendy games that I bought are both CD games, one for the Duo, and the other for the Sega CD, and I bought them because I really like them both and don't want to play CDRs for extended periods in my machines.
The guy in the video seems cool enough except that he's showing it off on YouTube, and he frequents NintendoAge. So that means he's a schmuck. I'm surprised that he was willing to buy Magical Chase, considering that it isn't VGA graded.
Chris