Parking is a thing that sometimes doesn't follow the normal laws of economics.  Paid parking makes sense in crowded cities where there's limited real estate and lots of potential users.  Plus the price is roughly correlated to demand.  That's how supply-side economics works.  And the price and availability are a disincentive to use the service; sort of a double-win. 

I went to a minor league baseball game recently, and it was completely the opposite.  The price for parking was constant, so it's completely unrelated to demand.  And the supply was plentiful, so it's not like they were discouraging it.  Plus it's nearly impossible to do anything other than drive to this place; there aren't other options.  I guess it was simply so they could keep their ticket prices low while still maintaining a profit.  A shitty practice. #money