Starbucks is now reported to be about to insist that anybody using its facilities buys something. I would in principle have some sympathy with this, after all, the facilities cost something to maintain.
But: I used to fly frequently out of Detroit Metro Airport. There was the huge modern terminal, complete with a mini Metro line, built for NorthWest Airlines (now part of Delta), and a little old terminal where everybody else flew from. For a morning flight, one had to check in, go through security, and then twiddle one's thumbs for over an hour. There was one coffee stall open, a Starbucks. You just wanted something to wet your whistle, but not enough to require a subsequent trip to the toilets, or heaven forbid, a trip to the toilets while on board the 'plane. These were not large aircraft. The coffee stall had a display of various cup sizes, ranging from small to medium to large to gigantic. Of this range, the smallest on offer was a 'Tall', which was
12 ounces of coffee, most of which had to be either thrown away, or left for the cleaners to deal with. What a waste, and what a rip-off. The 'Short', 8 ounces, would have been fine, or even the 'Demi', 3 ounces, for any Italians.
So I have no sympathy with Starbucks wishing to save their money, when they are good at extracting ours from our pockets.