Because I have a complete romset and it was hassle enough obtaining a complete one with proper bioses intact. I really don't want to go thru that journey again. Plus I'm mainly interested in 1980s arcade games and some into early 90s. I have no desire to play anything newer in terms of Mame stuff. It's weird, but the more elaborate and "movie like" a game gets the less interested I am in it. That's why my main targets are older arcade, Commodore 64, and Amiga...all stuff I grew up on. Those were the days when you'd marvel at the little extra bit of good looking graphics and game play they fought to squeeze out of the existing hardware. Plus I like the retro "shoot em up" "stick figure" type stuff, where you could clearly see if you were getting shot or not, etc. The movie like graphics of modern games seems to "generalized" and undefined to me in that respect.