> I could have /walked/ 2.3 miles there and back, sat down for dinner in the restaurant, and still done it in less than 75 minutes while saving $14.

The goal is not to save money -- cooking is even more efficient -- the goal is to trade money for time. Presumably you still could have worked all of those 75 minutes and gotten some value that way. Now the service could probably work better along other metrics but it does seem like the value delivered is non-zero.