Incidentally, he lives in one of a small handful of suburbs in Australia that have a palindromic name (glenelg).
I know it's evil to sell it like that, but take a look from the other side of the picture.
What if you have slow internet? Or you simply couldn't be bothered to download so many games? Provided that it's not a scam, the DVDs would be a great way of getting roms for you.
Not advocating piracy, but I'm just saying, there might be some people who could use something like this.
Even so, $75 is insane. If his goals were indeed philanthropic he'd be charging for the media at most. $75 ranks up there with my daughter walking outside and picking up the quartz from the neighbors yard and selling it to the neighbor on the other side for 25 cents per rock. BTW: we made her pay the kid back...
Fwiw, I live a few minutes away from Glenelg. Bandwidth is expensive around here, and most ISP plans have download caps. I didn't get to see his page before it was taken down, but if he was offering all the ROMs and CHDs on disc, you'd have trouble downloading all that in this area for under $75. You could theoretically do it for $60-$70, if you spent a solid month downloading with the cheapest ISP and didn't use your bandwidth for anything else.
Not excusing his actions at all, but it probably explains why he got buyers.