There is a BBQ place in Dallas, Sonny Bryan's. They run several restaurants now that operate normally, but the original spot opens at 11:00 every morning. When they run out of BBQ, they close. Doesn't matter if it is 12:15 in the afternoon or 6:00 in the evening. When what they cooked that day is gone, they close. People drive from miles around to eat at there.
There is a BBQ place here in Austin, Franklin's BBQ. Pretty much the same deal, but people start lining up for lunch at 9:30 - 10:00 in the morning. About 11:00, the order-taker starts at the beginning of the line and starts taking orders. When they get to the point in the line when they determine they will run out, they send the rest of the line on their way. They send people away almost every day.
Both of these places are legend and do very well for themselves, operating the way they feel best serves their clients without sacrificing the product. It is all about supply and demand. They both have a fabulous product, that only they can produce. Are there other BBQ joints in both towns? You bet, a ton. But if you want the best BBQ in Dallas, you go to Sonny Bryan's. In Austin, Franklin's.