Even tracks that aren't leased face the same sorts of issues - a track owner who owns the property the track is built on may shut the track down if he finds another business opportunity that's more profitable.

That's basically what happened to Bumps 'n Jumps here in PA. The owner of the track also owned the property/building so you'd think that would have secured the track's existence long into the future. Thing is, he got involved in a side business in the summer off-seasons when the track didn't make money that exploded for him. I don't know the exact details, but I'm guessing the situation for him was either make less money over the winter running the shop/track, or make more money working his new side business year round and lease the building to someone else. The former owner did initially sell the business and leased the property to the new shop owner because he wanted to keep the track alive, but the new owner ran it into the ground and stopped making lease payments. It was less than a year after the new owner took over that the track permanently closed and the building is now leased out to a regional plumbing and hvac company who I imagine will have no problems paying the lease for the indefinite future.

You can only put up with so much work and so much crap from running a race program if you're making less than you're capable of and not already fabulously wealthy.