One of the dudes that asked the tough questions historically has been agent provocateur with other manufacturers and has a history to prove it. In addition claiming to be a tough as nails "asshole, this is just how I am and my personality, tough shit" should not be worn as a badge of honor. There is a way to discuss topics without trying to be a door kicker.
There was recently a thread in GKD where someone, a member stated matter of factly from out of the blue that ZT uses inferior materials to other companies. He conveniently never returned to the thread last I saw, I called for evidence of the bold claims, and none were given, again last I checked. Someone coming in, a newb reads this and takes it as truth. And forms a prejudiced opinion. How is that constructive at all?
Too many people confuse this place for a place to simply bitch about everything they can muster. That is NOT what this place is for. If you or anyone else have complaints about a product you take it to the manufacturer directly, you don't go to a public town square and shout like a mad man about conspiracy. I don't know how many people posting here right now have ever or currently owned a Hinderer knife, I have 3 myself. One must take certain authoritative sounding posts from non-authorities with a grain of salt.
There is a little thing called tact, when these hot headed heat generators lack it, they bring more problems than they purportedly fix. These same people feel that tact is for girly men and not for the real machoest macho men of the group. Being polite and well mannered is not a weakness, sorry to break the news to some folks. When problems arise and misinformation spreads like wildfire, we have problems. It may not be the sole reason that some manufacturers are not here, but it surely cannot be excluded as a very viable possibility.
Imagine working hard for 20 years on something, only to be told repeated by an anonymous no named person that the product is absolutely shit, and not worth it's price, and is of shady origins? It seems counter productive to provide feedback in that manner because there is only one obvious way it can be received. This is why I've said it in the past and said it often. If there is a problem, it needs to be reported. We will do our best to deal with it.
Oe final thing, this is not about manufacturers at large, it is about one, as per the title. Every other case is different. Some manufacturers leave because they don't feel appreciated or if they can benefit their business as karda said. B the same token, they don't want to hang around where people get infracted every time they touch their keyboard either and be labelled a troll for asking a truly honest question.