Not sure how I found this video, but, the guy is spot-on.
He reveals his "true" profession about 57 seconds in. This is a guy that knows the real business he's in. It's not bars, but the marketing of bars.
Same for dental practices. The business of dentistry is marketing dentistry. It's our first and most important job, if profits are the priority. (And I know of no other higher priority.)
Another "lesson" this fella's learned: The more you "do" or attempt any given difficult task, such as opening a bar (or a dental practice for that matter - if he thinks opening a bar is difficult!), the easier it becomes and the higher your chances of success.
Here's the video: