Every Mac user I know has had their Mac purchased by their employer. I think that creates a certain price insensitivity. An employer knows that the cost difference between a Mac laptop and something like a Dell or Lenovo is inconsequential compared to the cost of the person using it.
I believe so. I regularly sell used things. I'm always surprised by the amount of calls I get for my Apple stuff. I'm not sure I'd be able to sell a 3-4 years old Dell as easily.