A park' s user fees are employed to maintain the park  When fewer people use the park, it suffers less wear
Thus raising user fees improves park maintenance even if the number of people who stop using the park because of higher fees is great enough to reduce the revenues devoted to maintenance
Road taxes are raised to encourage more people to use mass transit. But since the fee paid by each commuter does not equal the cost of providing transit for that commuter, a mass transit service will deteriorate even as it takes in more money.