I can make much better coffee at home, and I can take one with me to work in a flask.

But lots of people don’t want to, dont have time to, or can’t make fresh coffee at home and therefore buy it out.

But even if i make it at home, if I want a second coffee during the work day, I’d have to either have instant coffee from work or buy one.

FWIW: My take on Starbucks is that their coffee is a) usually quite average at best, b) variable quality depending upon where you buy it.

Where I live there are lots of alternatives which serve better coffee for about the same price, so I don’t really see any need to use Starbucks.

Last time I had a Starbucks was on a road trip at a motorway service station. It wasn’t very good coffee at all, and afterwards I resented having paid service station prices for a coffee I didn’t enjoy. But in that scenario they have a captive audience.