question about moonlighting

I was talking to a Emergency Medicine intern buddy of mine today who's at Univ. of Chicago and he was mentioning how they can moonlight in fast-track from their intern year and make $50/hr for 12 hr shifts. I'm just curious how this works for ortho surg programs. I understand how much more demanding a surgical internship probably is but is there any moonlighting in ortho residencies and if so, what year do you usually do it? During my AI's, it seemed as if you're busy as h$%& during all 5 years!!