I think that prior to some of the breakdowns of cost and time it seemed that a developer should be able to write some code and get into business. There is a lot more work going into selling an app then just writing the code. There seems to be 3 distinct levels of code generation.

1. Give it away. You get nothing in return but thanks and you have very little costs but your time.
2. Donation tab. Put some tab in all of your programs that allows for a quick paypal or other donation, (you only loose 4% with paypal) its on the honor system so your return is going to be low.
3. Ovi or some other. The start up and yearly maintenance costs are high but if you have a good app the revenue stream has potential to keep up with large yearly costs.

For small businesses there are many hidden charges. If you working out of your home the homeowners insurance will probably go up for the newly classified business computers. There are many more

I have been amazed when I have spoken to FOSS developers that there are very little donations and not even that many thanks.