A coworker just reported the same concierge conversation you're mentioning. She was really put-out and frankly can't afford another $1800/yr on top of insurance premiums.

She asked her doctor about it and he said that he's short staffed and overwhelmed by patients. He claimed the concierge model would allow him to spend more time with patients but didn't specify how that would affect patient insurance coverage, final costs, etc.

I think it's a shitty business decision, and indicative of a failed healthcare model. The gap between people who can afford healthcare is widening and that's terrifying.