That is indeed customer service. (The $1.49 was on the house.)
Of course, there's another customer service issue -- for the museum to work out convenient lunch delivery for people at the nearby museum so they don't have to drive out into surrounding streets to find food, like cats.
Donald Trump would have lectured about that on "The Apprentice." At least I know who won the apprencticeship yesterday. Thanks for the service.
I, for one, don't like to have to approach customers with aggressive courtesy.