Fair enough. You provide an interesting scenario: paying to provide free apps. I don't know the details of the Marketplace model. Apparently, you do.
I'm not familiar with the exact details myself, but as far as I understand it, you have to pay the fee to publish apps on the marketplace, regardless of what they cost. And also, I believe it's not possible for me to just put the app on my website and have
the users download it from there.