You don't, but you are also statistically unlikely to spend money (or, perhaps spend very little) at where ever you're trying to park so everyone concerned would prefer you move along to make room for a paying customer please. :)
I guess if you s/park/live then this is why everyone concerned would rather poor people just get on with it and die already. I mean if you're not going to spend money then please move along and make room for a paying customer.