Hah that guy has , uh, nerves!
I saw a guy at the indoor range take a broom to sweep up brass from infront of the line before. I thought he was pretty bold, although he was just getting 'his' brass, I figure once it goes past the bench it belongs to the house.
You can ask the range guys to buy the brass off them. I have never bothered with it, although I wouldn't mind rifle brass..hmm...