Waitress or economist?

Another non-MBA update. Work has been keeping me busy so not much has been accomplished the past few days on the MBA front. I did meet with a retired partner yesterday, who has been a mentor to me, to discuss my plans to pursue an MBA and he was very helpful and gave me some great advice. Today I discuss with my immediate boss, who may be more aware of my plans than I thought, since he and the retired partner I spoke to are good friends and have apparently discussed my plans for an MBA. We will see how it goes today. Still no progress on recommenders, but that's because I've been waiting to talk to anyone else about it until I speak to my boss.
I guess I lied again about it not being an MBA update. The real reason for the post was a funny thing happened to me yesterday. I was at lunch with a colleague at a sushi place near the office. While we were eating, I overheard the guys at the table next to me talking with the waitress about how this restaurant doesn't serve coffee. As in, it's not on the menu, you can't get a cup even if you want it. When we finished our lunch, the waitress asked if there was anything else we'd like, and I asked her whether it was true that they didn't offer coffee. She said yes, and I remarked that it was interesting that they wouldn't, since it seemed to me that people would be more likely to stick around and possibly order dessert if they could have coffee as well. I was not expecting the reply I got. She explained that they are a smaller restaurant and economically it's not worthwhile for them to serve coffee, because for the price of a cup of coffee, people would end up sitting and talking for another half hour or so when, without the coffee, the people would have left sooner allowing the restaurant to seat another customer who would then be paying more for appetizers/entrees/etc than customer 1 would have for coffee. Economically speaking, the opportunity cost of offering coffee was greater than the revenue it would generate. She got a good tip.