I used to play the grey gameboy back in Grade 3 (it was a gift from my uncle), and back then I didn't mind holding a gameboy around and play it outside...
Now, first of all I don't have so much idle time when I'm out (I'll be talking, driving, shopping, walking... other than sitting around doing nothing), and then lately I can't really stand the small screen.
Also, since I import quite a lot... I can't really support any other gaming system financially.