There is also other things at work. When the economy as a whole is slower, there's a greater demand for used knives, and dealers are more apt to take a used knife as a trade in on a new purchase.
When the economy is better you have greater difficulty in selling used knives at least in certain prices catagories. In My Experience.
We've talked about the internet in other threads, but I still find it inetresting because with the internet and forums such as this the velocity of information has increased tremendously. Now you can hear about great prices and make and order, or hear new information that affects your knife buying all within seconds or minutes.
What's the results of that? It accentuates the peaks of demand, because everyone wants one and has heard about it. It also makes demands trail off more quickly, as products get replaced with new products and fall out of favor or style.
It also encourages knife companies to innovate faster, if your a company that can do that, CRKT springs to mind, you're the ticket. If you're a company that continues to be locked into traditional knife lines, you get less interest, receive less of this new market, etc. I think knife companies have been using collabration with known makers as an avenue in providing this innovation.
The liquididty of knives increase too, as you can create demand and sell them in a hurry. You also have the aggregate effects of bringing sellers and buyers together in larger numbers for more intimate market "conversation".
On the flip side if you're a company that doesn't make it in terms of quality, customer service or honesty, then you can get hit hard, where as before you could get by with it.
My guess it's probably tougher than ever before to be a knife company and having to deal with these issues.
You could argue that net sales is a small part of some companies sales, and that's probably true. But even without the web you still have similar kinds of effects.
DaveH