True....that there is often someone being hit by the other side of the stick....Good on the bikeshop for accepting the mistake and holding onto the deal though....
They listed it poorly, their online picture included shifters and calipers. and confirmed the same info in their online q&a. I was impressed that they resolved it quickly and without quibbles. I will probably source most of the rest of the groupset from them due to their good customer service.
Zero sum game - his luck is the shop getting burnt for screwing up an internet listing.