I always ask before I go after someone elses brass just seems polite and in some cases I have even had folks that picked it all up and dropped it off with me.
Heh, I pulled into range 10 out at BLGC one day, apparently just after someone with an M1 Garand had left. There wasn't any '06 brass on the ground, but they'd picked up their Greek HXP M1 enbloc clips and left them on the bench for whoever wanted them, which just happened to be me. WOOT! 18 freebies!
And I found like, 2 boxes worth of brand-new just fired .300 Win Mag brass under a bench one day. Added to my trading stash. And .223? People leave new .223 laying around like they were .22LR. 9mm and .40S&W, I'm pretty much sick of picking those up, but I still do. Pooper Scooper works pretty good for picking up brass, just put a piece of duct tape across the rake tines so they don't slip through.
Hell, I'll pick up ANY brass that's not rimfire. If it's Berdan primed, it goes in the scrap bucket. Calibers I don't use go into the trading stash. I'm not quite anal enough to rake up the rimfires and shotgun shells yet.
Can you turn hulls in at the scrap yard? I've never asked.
A. Do you need a new hobby?
B. Do you have plenty of free time?
C. Would you rather shoot? Load? or both?
Do an economic analysis for your self...Let's say you spent $1000 on reloading gear and you saved 20 cents per round over new ammo...you break even on the equipment is 5000 rounds. How many rounds per year do you shoot? We haven't factored in you time spent on reloading yet, but you see where I am going with this?
I've been reloading for over 20 years, so my answers to the above questions are pretty obvious.
On the plus side, I can reload better quality rounds than I can buy. I enjoy the hobby. Even when I can't shoot (weather, time,etc.) there is always something I can do at the reloading bench.
BUT, there is a LARGE investment in time and equipment on the downside.
Is it right for you? ONLY you can decide.