Coffee shops are fantastic. My other half doesn't get why I go out to buy a coffee that I could easily make in the house for next to fuck all, but it was never about the coffee - it was about being out of the house and watching the world go by. There's a coffee shop in a hotel that overlooks the thoroughfare between one of my local city's biggest shopping centres and it's rail station, and it's nice just wasting an hour or two watching people go about their lives.
The cost of the coffee is just a warmth and comfort tax really for sitting there.