One key business insight is realizing that some customers cost more than they bring in. That may or may not apply to those restaurants, but a restaurant can't

One key business insight is realizing that some customers cost more than they bring in. That may or may not apply to those restaurants, but a restaurant can't be everything to everybody. They might do better by not trying. Consider this applied to tech companies: you need to make very different decisions if you want to start a free social media site versus a webapp aimed at businesses.