Then why not allow

Here in Canada, a Mac seems much more expensive then a similarly equipped PC from Dell, HP, or whoever.

If that is not the case elsewhere then why does Apple fight so hard against competition? Between their lawyers and the DRM they added to the Mac OS to prevent it from running on regular PC's, Apple has fought very hard to force its customers to buy their hardware from Apple.

This is because Apple has huge margins on their hardware and, even with their great brand name, they would loose a lot of hardware business if their customers had choice.

(I'm not defending any of the details of the MS backed study - just the conclusion.)