I've sold a few times through Craigslist over the last two years.
My township's police advertised on facebook a while ago that they allow people who do business through Craigslist to meet up in a designated area of their parking lot that is under constant surveillance and is within sight and earshot of the front desk. I have utilized that twice to sell coins and silver bars.
On top of that, my teenage son has always went with me and stayed in the car and I also carry when meeting someone from Craigslist.
I've been practicing martial arts for almost 20 years, the last eight of which have been some form of grappling. I am a 240-lbs. purple belt in Brazilian Jiu-Jitsu, and can bench in the high-300's, squat in the mid-400's, and deadlift 500 lbs. My teenage son also trains Jiu-Jitsu.
With all of the above on my side, I feel selling on Craiglist to extract the maximum value of my coins is a worthwhile venture.
That might not be the case for anyone else though.