Craigslist purchases can be done safely - if someone says 'Come to my house' I say 'No Thanks!'. I make busy McDonald's parking lots a general choice for either buying or selling. Or places that have good outdoor surveillance cameras in full view (any Wal-Mart parking lot).

My Craigslist experiences have been positive with proper vetting of advertisements and so forth. I shop 'local' that way.

Received and given many a deal via Craigslist. Last Craigslist purchase I made was for a used DirecTV receiver which has a built in digital HDTV OTA tuner. Ended up
talking with the Fort Carson soldier that was selling it for probably 1/2 hour, thanked him for his continued service, and gave him $40 for the tuner which he is using toward a big rear projection TV (why, I don't know) purchase. I use the tuner with a 30" HD ready Samsung tube TV that came out one year before the required integrated digital tuner. Spanking good picture on that TV.

I digress. My stuff for sale goes up on Craigslist.
Would PG adding this feature to their forum increase the outlet for such transactions, perhaps. But probably not a significant amount.