If there was enough to make a profit it wouldn’t be open to the public.
Good old fashioned fun with the family.
There are enough to make a profit. The Debeers family paid off some Congressmen to make it a state park. The book “Blood Diamonds” (no relation to the movie) goes into detail about how diamonds are one of the most common gemstones. The Debeers cartel spent decades going around the world either buying or otherwise locking up any new pipes that had commercial potential.
That happened when the Arkansas pipe was discovered.