post count dont mean anything.
There was a user Cota Godly one or something like that and he was a member for a few years and had a few hundred posts. He ended up being a scammer. It something you will never know. A 0 post member is just as dangerous as a member with 300 posts. Theres also lurkers, people who never post in the BST and just prey on people by using the PM system and try to get trades or sales.
All a new member has to do is go spam 20 posts and then they would get in. Just do some homework before you throw 100+ down the drain, maybe 10-20 bux who cares take your chances. If something sounds to good to be true than it prob is. Check refs if the person has any see what kind of transactions they had. Sometimes people make up refs. I wish people would separate their refs like buyers/sellers/traders that would be a little better for other members, but its up to them. I separate mine for the sake of other members. That way they know who I sold to and who I bought from. People can go around and buy from 20 people say I have 20 refs, and you dont check and be a scammer.
Just be safe and smart and you will be fine in the BST.