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All indoor ranges I know recycle brass as a secondary source of income (more accurately: I know of no indoor range that _requires_ you pick up your brass).

Most of those places don't mind if you pick up your own brass, just ask the RO in advance. This would be particularly important if you shoot and reload an unusual caliber. I have yet to go to an indoor range that won't let me get my own brass. The (correct) business thinking is: The amount of $$ you might lose from the brass he/she picks up is less than the amount of $$ you would lose by making this guy/girl an angry customer. Happy shooters = returning customers.

On the other hand, I've seen people abuse this by trying to sweep their bay and the 5 other bays near them. That's bad mojo.