"1 reformat and install the Linux distro of their choice. Or, if they're up to additional work, BSD." Just how I, as an average computer user who spends most of his time in MS Office and a web browser, want to spent a Sunday afternoon.
"2 buy a Mac in the first place. Apple doesn't give a damn what OS you run. Install a Linux distro, install BSD, even install Windows, Apple doesn't care. They won't support you if you don't have an Apple OS running, but they don't care what you have running. They'll even provide Windows and (some) Linux drivers for you. Then you're on your own." Apple may believe this is a selling point, and perhaps for a small portion of people in graphic design who need software that is only available on Mac and software that is only available on Windows, it is. For the average user, who wants to spent $200-$800 on a computer, not so much.
I'm amazed how out of touch techie people often are with the average computer user and consumer.