I've only bought from CL. However, our local police departments have several parking places and their lobby open to these types of sales. I think this is a very good idea for any municipality to enact. The only added expense for the city was some paint to color in the spaces - they are highlighted as online sales spots and directly in the camera view, all clearly marked.
After I bought a girls bicycle from a lady at her home, I realized how this type of transaction can go south. She invited me in through the front door clear through the house to the garage. If I was a bad guy, she would have been easy prey. Thankfully I am not a bad guy! But some people just don't think of the risk.