Well for one thing American console and arcade games in general were pretty much thought of as jokes up until the last 5-7 years or so, which would have included most of the Geo's life. If some hack at Aklaim or Activison or EA was getting his ass kicked kicked in the $50 game market by Nintendo, Sega, Square, Konami, Enix, etc then trying to sell $250 games wouldn't be a very good idea in general.
I mean, how many western developed PCE/Turbo games are there?