Your efforts are much appreciated by other responsible shooters. I too grew up in the "school of pit shooting" as well as my kids and grand kids. When we went shooting we took targets and then took them home, along with as much as we could carry of the other trash left behind by the less considerate.
What I have observed, most notably with the Sultan Pit and it's subsequent closing, is the growing number of shooters that think it's sport to not just shoot all the garbage bring with them into as many pieces as possible, but to also shoot up as much of the surrounding area as they have ammo for. I witnessed a coupe of shooters at the Sultan pit do their imitation of Mid-East celebrants, shooting full mags from their AK-47 into the air. During the summer months at the Sultan Pit the flies were thick due to all the pineapples, watermelons, eggs, and who knows what else was used for entertaining target material that nobody cleaned up.
We've had posters on this forum brag about cutting trees down with their gunfire.
The results of the above are obvious. More and more accessible areas are closed to shooting mostly due to the actions of those who for lack of a better description, just plain irresponsible, and we all pay for it.
Again, thank you for your efforts, and if you happen to leave anything behind, I'll do what I can to pick it up along with my target material.