So I think you might be excluding people that are already paying double that per-year (never mind the cost of parking/etc if they actually own a car). Also, this business seems like it might actually work out well in a place like new york, where you don't own a car, but have too much stuff (and enough money to actually keep that stuff)

One of the key reasons people keep cars is because they are very helpful in the case of moving. If you had all your non-essential stuff in a service like this, moving would all of a sudden become significantly easier