Now I am confused. You want people to be able to make their own decisions as grown ups, yet there are young people on these forums and this is the reason a new members videos were recently taken down and posts are removed to protect the young and innocent.
If a junior has several hundred pounds to spend on a knife I would hope their parents would keep an eye on them, don't you? Mind you might be a case of more money than sense!
So what would have happened if a young person (18 maybe, a bit naïve perhaps) had bought the knife and got ripped off. There is no minimum post count to sell something and that knife is worth a lot of money, so any random person can come here with a 250 quid knife, pay a tenner to sell it and walk away with an extra 200 quid, and could then not bother sending the knife. People get mugged off all the time, and don't you think with eBay's ban on knife selling, this may start to happen more and more and eventually an unscrupulous person will be in here ripping forum members off (That sounds painful!) and it could become a regular occurrence. I'm not saying it will happen, but the odds are on that it could, and if people get used to a person joining, selling and never coming back and the deal works fine, then eventually people will become blase about worrying if they will be ripped off.
Hence my reference to common sense (grown up decisions). Number of posts is not an absolute quantifier of honesty is it?
I am still owed a Leatherman Wave and Innova torch from a member of British Blades who was a Moderator there! I had absolutely no reason to mistrust him, sent the items off in good faith to have a sheath made for them both and never saw my goods again. His sister was also a Moderator there, and she has done the same thing to others. If I can be ripped off by somebody who had that sort of a standing on an internet forum and who many people trusted and respected, don't you think it is possible that a new member could do the same?
I'm sorry you were ripped off on another forum.
But again the logic of post numbers (I'm assuming) didn't have relevance. Yes a new or old member could be dishonest. Common sense tells me that I want safeguards if I'm parting with a lot of money, as with this knife or the canoe I bought through ebay and collected. Afterall crooks are cannie, just take the example of the Nigerian General who took my life savings last week

I do understand and commend your intention of warning people and I didn't intend to confuse anyone, so I hope my answers have helped.
Best regards
Alan