On a related issue, I am always puzzled by the pointless insertion of an apostrophe in a restaurant's name. One such that comes to mind is Mango's (either in Ft. Lauderdale or Miami Beach). Whenever I see a name like that, I always wonder to myself, "Which Mango does it belong to?"
Don--You are, of course, correct.
However, rather than calling the insertion of an apostrophe "pointless", let's call it what it really is, namely, incorrect. Like you, I have observed restaurant names that consist of the name of one ingredient or food product, with the incorrect addition of an apostrophe, and I have also wondered--"Which 'Olive' (or Mango, or Tomato, or... ) does that restaurant belong to?"
And, more importantly, how do pieces of fruit, vegetables, or other food items accrue enough money to open a restaurant?