Or because fighting games are all recycled shit year after year.
Thats Street Fighter in a nutshell and Fightcade is for playing CPS 1/2/3 and Neogeo.
THE BEST METHOD to run PSX games (and everything else for that matter) is via Retroarch - http://buildbot.libretro.com/nightly/
If you have any questions on how to set it up on Windows please feel free to ask, its very easy.