The guy in the video is a tool. I tried watching the video out of curiosity, but I got into the part about the first Madden on Genesis selling and was able to point out a few of his facts that were incorrect, and shut it off.
Heres what I noticed when he was stating his case:
The "first installment" of John Madden Football is not the Genesis release, and the first Genesis release, was never highly valued before the graded copy he speaks of sold, and it was never "rare" as he states, because that game sold over 400,000 copies based on my Wikipedia info, which I know is hit or miss.