there are holdapers who will buy second-hand products and tell the sellers to meet up in a place. A place where you don't know your security.
This is far from ninja fair platform and mission.
well just to answer this.
meet up is good, both parties can be sure that the product will be check and pay after it.
danger is just all around the place.
never meet anonymous people in private place.
make sure there are crowd in your surrounding.
this will make your security better.
Most of the time people has no time for meet up and meet ups are just for the people who has the same country maybe Fair ninja can do some precautions about this matter and most of the time I believe people preffer shipping because its more convinient and specially to those who are in different country. If you cant stop meet ups then meet up need the police station or in public place to prevent this.