My program made us take so much f*cking call (about 72 calls per year for every damn year) there was no time or energy left to moonlight. And it was prohibited anyway so we would be free to take more call.
We did get OT for being stuck in the OR after 5pm, but it was just $50/hr and often for less than 2h over, so I usually just tried to run away at 3pm and never get forced into OT. F*uck that ****.
However, there are programs where seniors take call a few times per year (instead of a few times per week), and they can moonlight all the time and make $100k per year.