Comment by pvtmert

simply, even cleaning and keeping it tidy is a quadratic equation compared to the space available. people leave their garbage behind or spill their coffee, making a single table somewhat unusable for some time. there are already min. number of employees, mostly busy at the bar. having extra space equals requiring more hands for cleaning, hence cost not linearly increasing but quadratic with the square meter.

another thing is, if the space gets full, people get out anyway, but chance to buy stuff.

for example, let's see there are 2 empty tables right now, you get in to the line, there are 6 people in the queue. imagine 3 of them somewhat occupies the those 2 empty tables, even if you resign the idea of getting coffee, i guarantee you that at least 1 of the other 2 would still get coffee but just move to a nearby park or bench. which starbucks obviously does not pay the rent for...