Most f the time these things are paid by grant funding, i.e. the grant will be a one off that pays for the trails to be built and the car park to be built.
Then the grant runs out, and to be sustainable they need continuous income.
One way of doing that is to rent a cafe spot, and another paid for parking.
Its expensive parking, but its not just paying for the parking… its very different to a town centre – parking charges are low because you generally go spend a load of money in town / do business. You ain’t spending money in the forest when riding round…. unless you eat at the cafe I suppose.
Maybe the parking should be free, and there should be a gated entrance where every rider has to drop a couple of quid in. This would be nice, but theres all kinds of reasons why it wouldn’t work.