I have to say your single sentences can get my mind racing at a hundred mph. Example, Why institute the sharing (AirBnB model) if it is less about sharing and more about not paying for parking? Does this mean there is room for a purely valet model, where one drives to the airport and a valet drives it back their home instead of parking at the airport? Is it going to be a common practice for people to be the AirBnB of "this and that", making the marketing more important than the service, especially when sharing is not the main appeal?
I take what I can from your comments, like your perspective on the sharing model above, but it makes me think getting a YC interview would be bitter-sweet because really I would want to interview you.