I get why there might be an aversion to handing over parking spaces to for-profit companies, but still it makes a lot of sense from a variety of perspectives to let car sharing companies to have them for free or cheap. One parking space will serve dozens of people, not just one, and some of these people would, absent carsharing, own cars and take up even more of that precious on street parking.
Anything that helps reduce the number of cars in an urban area in a non-punitive fashion should be embraced.
