Cafes Wish Lingering Customers Would Leave

It's never really been an issue for me, but I see in a recent news article that some cafes, at least in the Washington DC area, are trying to encourage customers who stay a long time to get up and leave. The idea is that their table could be used by a new customer and the cafe could make more money.

It's not an issue for me because most of the times I go to cafes, few people are there. I'm usually in Starbucks or some other national chain. I haven't seen them telling anyone to leave, ever, alt...