I don't believe that Starbucks wants people to go there, just to hangout and use their bathrooms. That is your generalized opinion. I personally have never noticed someone there that had not ordered anything. I also don't go there much, or am creepy enough to ensure everyone has purchased something. As someone who worked at a Subway for 4 years, I would ask people to leave if they weren't buying anything. I ain't going to clean someone's poorly aimed pissed off the toilet seat, who didn't buy anything.