Joel Ivory Johnson, a pretty active mobile developer, has written about his experience in submitting a simple application to marketplace. The very simple demo application, Speedtracker, which simply measures speed using GPS measurements, was coded specifically to test the ease of the submission process.
Joel initially planned to release the app for free, but was convinced to try and charge for it, and released it for the lowest cost, $0.99. The app became available about a month after submission.
He reports sales of nearly $100 in the first week, and now seems to have developed a taste for the money, as he plans to release an update with better utility and a more attractive user interface.
The lesson developers should take away from this however is that Joel will likely make a few hundred dollars from possibly a 2 hours of work, and that the submission process to the Windows Mobile Marketplace is not onerous.
In essence, if you have a simple application and are not porting it to marketplace, you may as well be flushing your money down the toilet.
Read Joelâ€™s blogpost here.