I think there is a big difference between canceling and just not showing up. I am not saying that there needs to be a crisis to cancel either. It's just that not showing up suggests to me a rupture in the therapeutic relationship and that might be important to address. To intentionally no show is also a bit rude. If you stood up a friend it would be rude. Same goes for standing up a business colleague. To me, its like not showing up for a hair appointment. I would feel compelled to pay the service provider for their time. I would also want to examine why I chose that behavior.