That means that if a new user starts trying to offer things for sale, it's usually a scam. They're trying to steal your money or info, they don't actually have whatever it is for sale.
A user who has posted for a while and built a reputation on the forums is generally more trustworthy than someone who created an account just to "sell" something. That said, everything is at your own risk, so watch out for common signs of a scam.
The parking lot of a busy mall, in a nicer part of town, and they were held at gunpoint, so yeah, if you're serious, you might want to be careful who you meet and where...
OP
deals should be as conspicuous as possible
Agree to meet in parking lot of local police station
If they're not comfy with that arrangement
very suspect
Thanks everyone for your opinion, I have messaged him, we will see what he says requesting to meet at the police station " safe internet sale lot" they have