I think msandford is thinking that you think that this system would charge-cycle a car more than once per day, and if you do think this, he's addressing it by pointing out that the car would be charge-cycled only once per day, or less given that the system wouldn't need to utilize every car on a given day. So this extra <= 1 charge cycle per day shouldn't "murder" the battery longevity (or at least murder is way too strong of a word) compared to normal daily driving.