It's not so much about making a quick buck, they're releasing it to hype the release of the Wii's Journey of Dreams. And that's not gonna happen so well putting it on a different console.
Are they now?
Or is that what YOU think they're doing?
Either way, most gamers own a PS2, so they'd still get to play Nights. At the very least getting your hands on a PS2 is FAR, FAR more feasible than grabbing a Saturn.