The scenario you posted is so outside the norm for disc golf that it's close to being unique. Most private courses dont host NT/A tier level events or have anything like the facility you're describing even if they do. On the other hand, there are plenty of courses in public parks that either do or don't charge admission to the park itself. If they don't charge admission, it's impossible to charge them to spectate without closing the park for the day, by its very nature of being public anyone has the right to stand there and watch if they please. Same goes with paid entry public parks, execpt the fee being paid isn't directly to spectate, it's a park admission fee. A private course though, can do pretty much whatever it wants until our out of control government bureaucracy decides that they should set the standard and rules for our own good, because we're not capable of doing it ourselves.
(And if you can't see the day coming when they tell you you can't refuse entry to someone just because they're being obnoxious because it's discriminatory you haven't watched/read payed attention for the last 20 years.)
They can charge anything they want, whether or not the market will support it.. well, that's a different story. Reminds me of all my kids events when they were growing up though, first they charge you for the activity (dance, sports, music whatever, and then they expect you to pay them more to go watch it, even if the profits from that are also going directly to them. and don;t forget to not bring your camera because it's not allowed so they can charge you 30$ for the video ;p And yet we paid anyways.
In extreme disc golf, baskets would be people.. then it might make pay per view.
