87% of classic games are not available for purchase today

[A Black Falcon]

I mean, wouldn't it be pretty shocking if it WASN'T a number that high?  Games are made for specific platforms, they aren't something on a universal medium like printed words or music.  It's not like you can just release a game made for one system on another one without putting in a lot of work either porting it or getting an emulator working.  That's one of the things that makes gaming special, designing games which make use of the limited hardware they were programmed for...