Out of curiosity, when did Jerry announce that he no longer makes any knives anymore? 
As for value... Just like anything else, you'll see highs & lows, ebb & flow. There are a LOT of knives on the secondary market right now, and I don't just mean Busse kin knives, I mean knives... Custom and production. When the economy takes a dive, personal luxuries are sold to pick up the slack for most people. Even though I see many fresh signs of our economy beginning to show an upward trend, it will be a slow recovery, and many don't see the same signs yet but again, like everything else... Ebb & flow.
JMHO
+1 on what Jaxx said! I'd also agree that prices got way overinflated and there is a whole lot of INFI out in the market now (from people needing to sell, all of the ganza's, company store offerings, etc.). When I discovered Busse Combat in 2006, I picked up a new Hell Razor on the bay for around $300 shipped. I couldn't believe when the price skyrocketed on the secondary market (07-08) to the $600-$800 range! Same goes for some of the older combat grade models (i.e. Satin Jack). I picked one of those up with 3 sheaths in late 07/early 08 (can't remember the exact date) for $450 and they're up in the $700-$900 range now!

There are some older models that I wouldn't mind having, but I just can't bring myself to spend that much. IMHO, many other people share the same view. If a seller doesn't want to accept that their knife won't sell for the asking price, I suggest putting it back in the safe and waiting for the economy to recover!
Edit to add: Prices sellers are getting on the BAY, might be a double edged sword. You may get a high price one day due to someone putting in a high automatic bid, thinking/hoping that it won't go over a certain amount and the next day, very few interested bidders. There have been times where I have bid on a knife (well before the auction was over) and when beat by an automatic bid, I keep increasing my bid in an incremental amount to see what the guy ahead of me put. A few times it went
really high, then I would stop when it got uncomfortable.lol That being said, ebay all depends on the people who are actually bidding. One day you may get someone like me who keeps upping the price, and the next you may have very few bidders.