$4 toast isn&#x27;t <i>nearly</i> as good a business as $4 coffee unless they succeed in making the toast literally, medically habit-forming.  That&#x27;s Starbucks&#x27; entire business model: ensure that a caffeinated beverage is part of your morning ritual (afternoon is a nice bonus, but they make a stupendous portion of revenue before 9 AM), get you to do it with the same regularity as brushing your teeth, and ensure that there is a pleasant green priestess very physically convenient when you feel the need to make your obeisance to the caffeine gods.<p>(Says a habitual coffee drinker who came to the habit late in life, and who is very happy he&#x27;s moderately dependent on a substance which is highly unlikely to kill him, as opposed to being more-than-moderately dependent on any of the number of substances which would stand substantial risk of killing him.)