We are more of a learning league than a money league, but some teams like paying something, so they feel the drive to show up each week. In the end its about fishing.
We have had the same discussions about how much is to be shared. It really comes down to the anglers since they could just give you a bad story that sounds good. And how do you really know? You don't. So what we have come up with is that the winners must share the technique, lures, baits, etc. and describe the location fished. For example, shallow wood in mucky back bays in 3-5 ft of water, keys being cabbage and sand.
That means that no one can just go beat up their spot, but gives you the technique and enough to find our own spots. In the end we are all learning a lot more and fishing a lot more. I don't know what the answer is for your group, but this has worked for us for 8 years and the teams love it and are all learning every year from each other and time on the water. It shows in their scores, numbers of fish caught and in the end, we are all winning. The important part, is that no team feels burnt by working years for a good spot, then being forced to lie or give it up. Hey if they are seen fishing it, someone will try the spot, but we all run that risk everytime we choose to fish a spot in a tournament anyway.
Our goal is always to keep people fishing, learning and having fun. I am sure yours is too. Good luck and great fishing.