I've been fortunate enough to swap quite a few elk, deer, and antelope hunts to others in exchange for a variety of things. All hunts on both sides have been successful! It's a blast and making lifelong friends is well worth it.
Like Rob said it's a great way to see new country that you might have never seen before from a local or someone who knows the area well and not have to pay an arm and a leg for a guided hunt.