I thought of providing a mobile service of picking up wire from electricians who just don't want to drive to the nearest yard themselves in order to get paid.
By going to the jobsite then other trades might also want to join in by giving up their scrap thereby expanding the client base, as well as the types of products being scrapped.
I've had a few thoughts, but at this point I still work a full time job so I have to consider the hours I work at that and whether I could offer a proper service to make things profitable.