Many people have complained about the $50 a night pricing for a RV site at Del Mar Beach (Camp Pendelton, CA). I just learned that they now participate in the DOD ICE (Interactive Customer Evaluation) program. You can now leave comments with the DOD on Del Mar Beach RV Park (as well as San Onofre and Lake O'Neill).
When looking at the campground's information page on this website, you'll see the ICE link near the bottom. Click on the ICE logo to leave your comments on the DOD website.