agree with CoKE, follow the leo's, they rarely keep their brass.
one friend started with a sig p226 in 9mm because he had friends in the rcmp, for brass etc. another friend went with glock 22 in a 40 cal because he had friends in the city police here who shoots the 40. wonder if that makes them stalking the police?
i think if one catches the brass before it hits the ground, argue that the hot brass could have resulted in a burn injury, and keeping it as evidence for a pending law suit. but it is a no-no, not like baseball where one catches the ball in the bleachers, although standing at the range with a baseball glove would broadcast one's intentions.
brass left behind after the shooter has gone home would be considered salvage rights
i tend to help the shooter pick up his brass if close by and pass it back to him, courtesy that i was thought when i started shooting.
with the average pistol brass going for 4 cents to 15 cents, and rifle brass from 12 cents to 20 cents or more, would you not pick up a nickel, dime, or quarter on the sidewalk or just walk on by, nothing being whorish (is that a word?) about that.
the problem being a brass whore, and you all know who you are, is when you go out to an outdoor range and can't help doing a check amongst the grass and debris to see if any brass abandoned out there, even before you unpack your equipment, that is addiction and i am quilty of it
indoor range brass pick up is easy, almost like standing at the street corner.
outdoor range pick up is like when one is actively soliciting and checking out the entire stroll. lol