"Sole Use" means that I am the only outfitter that can conduct hunts there. Mine is a federal concession with the National Park Service and runs through 2017. I could lose it if I violate the terms of the contract, but I don't intend to do that. I've had the original portion of this concession since 1986, and then it was expanded to almost double in size in 2007. Concessions don't limit resident use, but I have enough room where I haven't had resident conflicts to date.
I had a prospective client contact me last week, that hunted on state land last year and got burned. He said there were 4 operators in the same drainage, and he won't hunt with anyone again who doesn't have an exclusive area. I still have 3 good sheep spots left for 2009.