Prizes don't bother me at all. I'm enjoying learning C2 by doing things I wouldn't normally do, and challenges would motivate me, and increase my knowledge and experience.
I agree, finishing a game is damn hard. Starting is way too easy in comparison.
I've finished one game in my life, and even then I didn't consider it finished, but had to rush it out for a deadline. I didn't get the chance to polish it and add ideas that would've made it more complete in my eyes.
So I guess I would consider myself experienced in how hard it is to see a game through to completion.
Just because a game is finished, it doesn't mean the work is over. Creating a custom installer can take some time, especially if you've never done that kind of thing before. Then the website... and the marketing... and... ugh don't get me started ;p
Not that any of that would matter in a challenge...
I really hope we can get some sort of challenge going. Weekend challenges would be good as I know that's when people have the most time to work on stuff. Besides, that's my drinkie time, so creativity would be upped a few levels ;) but any time is fine by me!