There's more that's not being mentioned, and understandably so. San Francisco will reap huge rewards in parking ticket revenue. SFpark is so smart that it knows when a space is occupied and the meter has expired. Parking Enforcement officers don't have to drive/walk around looking for violations -- their handhelds will pinpoint them! Don't get me wrong, I am looking forward to seeing SFpark in action. I think it brings more good than harm.
I'm also in the parking (ticket) business, but on the other side of the coin: http://parkzing.com