Well, as there are currently no commercial games for Maemo (that I know of), the market is wide open. You have no competition, but it is quite difficult to tell how much "average consumers" would pay for Maemo games since Maemo isn't an "average consumer" OS at the moment.

Asking the current enthusiast community about commercial game pricing is probably just going to get you blank stares. Ask again when Nokia has had Ovi or whatever up and running for Maemo for a while.

It's difficult to write any games for Maemo 5 (except simple ones that run on current hardware) at the moment, because there's still no hardware to test performance on, and there's still some difficulties running 3D accelerated apps inside the composited window manager.

We also have very little idea what the hardware inputs / outputs will be (except that we will have a cam, vibra and accelerometer). The leaked picture of Rover from earlier this year didn't seem to have a D-Pad, which upset a great many community members.

Sadly, your best clue as to what the market will bear in terms of games pricing is to look to Symbian or Apple.

I would love to see some kind of FPS game based on the Quake 3 engine, using OpenGL ES...