They regularly close their lerger parks at night to cut down on crime. I guess you need to pay to go against that.
The NY state parks near the NJ border that have the Appalachian Trail pass through don’t close at night; I don’t believe the trail would’ve been routed through them if they didn’t agree to allow overnight camping along the trail.
Here in NJ it sucks; very hard to legally camp overnight in the woods (outside of a campground).