Demosthenes2:

Saying you want to discuss scope of responsibility, value of those responsibilities, ROI and compensation is one thing. Saying you want to know why someone else is paid more is another (the answer could be as simple as ‘because we think that other person has a better attitude and more long term potential. Next question?”)

Exactly.

Believe me, there aren't many (small) business owners that really want to risk prison just to screw some person out of a dollar an hour. Not for long, anyway.