I pick up a lot of brass at ranges. Public ranges in cities pick up the brass that is not wanted recycle it, or sell it as range brass to those who want it. I am a member of a local gun club, and the rule is that if any brass is laying on the ground and you pick it up, it's yours. I am surprised how much good, one fired brass that people laying.
As I travel around the out state areas and I see a ranges that public accesssble, I stop and check it out and again there is plenty to pickup. I take it home and inspect it and sort it to caliber and headstanp and it isn't long until I have plenty of brass.
I have brass that has been loaded numerous times and experienced only the occasional cracked neck when resizing and a few loose primers. I only shoot 38 special, 357 mag and 9mm. The 40's, 10 mm, 380 and 45 ACP are traded for other reloading components, all brass that is scrap is saved for scrap metal sale. That money buys reloading components also. One time when I visited a range, some one was there and had a 41 mag and left over 100 new casings laying on the ground. Those sold for $40. I would say I don't have an investment in brass. Matter of fact, my collection of brass has financed other facets of my reloading hobby.