Other than the brass that I have already fired, I am not above picking up extra brass laying around on the ground, or picking some out of the brass bucket. I treat it as I do any other fired brass. It gets de-primed, and thoroughly cleaned and then of course inspected. If it passes my inspection, it goes on to be fired again. If it fails, I squeeze the case mouth closed with pliers (so I don't confuse it again) and I throw it into my "bad brass bucket".
I think for your time and money, it would be more worth your while to sell it as scrap. If you were going to sell the brass to be used for reloading, you would most likely want to clean it at least enough so you can inspect it, and then sort out the undesirable brass, then post it for sale, ship it to someone etc. If you scrap it, you just throw it into a 5 gal. bucket, and bring it back when it's full.
I went to one of the ranges I belong to one day, and there was a guy collecting brass on the pistol range. I walked up, put my stuff down and got talking to him. I found out, he isn't a shooter, doesn't own a gun, and doesn't care to own a gun. He has memberships at several clubs, pays his annual dues, and only goes to the ranges to pick up spent brass to return as scrap. This is his only source of income, it's all he does and is completely happy about it. We got talking some more, and he was telling me, that between the 6 ranges he belongs to, if he really hustles, he can clear $1000 a WEEK!
There's money to be made, that's for sure...