If I charge a large deposit, it will deter people from using it. If I don't, there will be people that don't use it. (kind of a loose - loose).

However, if the hunter feedback / Rating system is similar to Ebays'. Showing how many people this person has swapped with. And how many have had positve experiences with a %....

Let me ask this question - Would you feel comfortable making a deposit into a system, then booking, say, an Elk hunt. With a past hunter review of this:

20 hunts swapped
95% positive experience
The 1 out of 20 complained because it rained the whole time.