Apple are doing something similar with there iAd scheme so it makes sense for us to do the same. There just seems to be alot of apps out there that are not finished or could do with a bit of tinkering, giving developers a bit of insentive would promote said apps.

Don't get me wrong here I believe devices such as the n900 have a great deal of apps, but I still think there is room fro improvement.

Money should go both to the site and developers, the site should take only what it needs, while the developers could perhaps get a share of the remainder based on downloads. A lame app that does nothing will obviously generate less cash as it's... well, rubbish.