on the contrary, i've had a coffee shop owner tell me to come and stay as long as i want for one simple reason. more people at a coffee shop is validation for the passers-by that have no context for the value of said coffee shop. lot of people being there is the only data point they'll get.
I do two things at coffee shops:
- go outside the busy times (ie morning and lunch trade peak times).
- Tell the owner that if they need the table then to let me know and I dont have any problem moving at all since i know I'm only going to be drinking a few coffees.