I thought the point of the story was the front-and-center statistics, 30 million pounds in additional sales outweighed by 50 million pounds in expenditures on airline tickets.
But that sounds like a 20 million pound loss most of which was wealth transfer (from Hoover to you!) rather than wealth destruction. In fact, because of the sideshow in ordering unwanted vacuum cleaners, the loss was apparently much larger and mostly wealth destruction rather than wealth transfer.
Yes I think that's the point of the story.