Some of us pick up brass because of cost. 38 Super is $140 - $200 per 1000. It's hard to leave it laying when you know it will be gone after the match.
There was a day when everyone was pasting, resetting, scoring, and picking up brass. Everyone helped. Now no one picks up brass unless you pick up your own. It is a different time now.
I try not to hold up things as I watch to see when stage resetting is finished and stop so the shooting can continue.