"Brooke Hammerling, a tech start-up publicist based in New York, recently paid $113 to Postmates for three orders of cheeseburgers and fries on a rainy day.

It turned out, after Postmates investigated the order, that the courier had punched in the incorrect price for the food, which should have been $39.78. The company issued a refund for the difference.

“I should’ve known they weren’t showing the actual prices,” Ms. Hammerling said. "

That pretty much summarizes the customers of these apps.