I pick up my brass and any abandoned brass left by shooters who have left the range (which is less and less these days, I may add).
Brass I or my son don't reload, damaged brass, or fired reloads past their prime, go into a gallon zip lock bag in a box on the shelf. When full, I run a magnet through it to cull out copper-washed steel cases, and take it to the metal recyclers with my crushed aluminum cans. I get more for the gallon bag of brass than I get for a lawn bag of crushed aluminum cans.
Is brass worth picking up? If I charged myself $10 an hour for the accumulated minutes at the end of a range session, probably not, but then the same with crushing cans and accumulating them. But the activity keeps me off the street corners hanging out with riff-raff, and gives me some pocket change for buying primers and the like, so the activity is worth doing.