No, your compatroits fill a void and are very smart business people. Perhaps you have to live in the mid-western U.S. to understand this phenomenon. In my town I'd have to guess that at least 1/2 (NO EXAGERATION) of all the restaurants are owned by people of Greek origin.
The Greek restaurant owners provide what people want...a"homestyle" meal at a great price. It the place people can afford to eat at often and it's not a burger or a taco. Tons of selection (too much) but that way you can eat there 60 days in a row and not repeat your order, ha. It's safe, reliable (because the serve the same soup every week, etc...),you won't leave hungry and the kids won't complain too much.
If they opened restaurants serving Greek food there would barely be enough demand to keep 1 restaurant open.
"Bakers are born, not made. We are exacting people who delight in submitting ourselves to rules and formulas if it means achieving repeatable perfection", Rose Levy Beranbaum