It's pretty easy to figure out max capacity of any of those businesses. Audit the traffic and compare against reported figures. So yeah, you can get away with it, but can't go overboard. It's safer to just waste some high margin inventory to keep. A bar I used to go to was a ML operation and they would just ring in lots of expensive drinks throughout the night and then the boss would come in and settle up the registers. No matter how much I drank my tab was always $20. The same was true for pretty much anyone that was a regular. It was great because it was definitely impressive to order a round of patrons shots for everyone at the bar. On a busy night there would be a couple instances where the DJ would bring up one of "the guys" and let him announce that the DJ was gonna play his 3 favorite songs and while they were playing everybody in the bars drinks would be on him. Very fun.