Rob,
I feel your pain. It is really frustrating when you are "doing the right thing" and it seems as if nobody cares. You are not just trying to protect the resource but also the "integrity" of it. Don't get frustrated if it seems that nobody is doing anything, continue to do the right thing "in your mind" and turn them in. Eventually, someone will take action. All it takes is one and the word gets out. I have several friends who are State Troopers and also DNR conservation officers. Some of them are overrun with the amount of stuff they have to do every day. Seems like there isn't enough time to do everything. One statement I heard a while back that rings true: Find a brand new CO, one maybe fresh out of school. Oftentimes they are trying to make a name for themselves! Those are the guys you want on speed dial.
I make it a point to personally go over and meet officers in every area that I fish. Most of the time, they are treated like complete crap by people. They are seen as the enemey when all they are doing is enforcing rules and regulations and protecting something that, for lack of a better term, cannot protect itself. I help them launch their boats at the launches, I give them an ice cold water, soda, gatorade, or something else from my cooler, and I tell them I appreciate the work that they do. I fish throughout the state of Michigan and probably personally know 15 different Co's. All of them have given me their business card with cell number and I have been told that, whenever I see something, have a question, or "might" need something handled, shoot them a call. YES, I have used it multiple times and I can tell you that this personal interaction they remember. They remember who I am, how I was with them, and in all instances, they came out, investigated the issue, and, in all instances, wrote tickets or made arrests.
Continue to establish relationships with them and offer to assist in any way that you can. Don't give up on being part of the solution to the problem. You just have to find a unique way to do it.