Some random thoughts:
First of all, I recommend that Busse knives, or anything else, be collected primarily for personal satisfaction and enjoyment. Don't ever buy anything you would not be happy to keep. I would not be upset to retain my modest collection for the rest of my life (sorry, Progunner

). If I get the opprtunity near the end, I may just give most of them away to family and friends. If I or my heirs ever realize a big monetary appreciation, it is a bonus.
Anyone who collects anything expecting to turn a big profit should research that economic classic, the Tulip Mania in Holland. Or more recently, Beanie Babies.
The significant difference between Busses and tulip bulbs or Beanie Babies is, of course, utilization value. If the Busse market crashes you still have a great, useful knife. It does not become less useful just because a new wonder steel arises. The original ATS 34 and A2 Busses are still great knives.
When and if the social order breaks down, think of the barter value of Busse knives!
The busse aftermarket has in the past, and will again, cycle through ups and downs. IMO, it is just now starting to come off an up cycle, which was brought on by entry of a significant number of new collectors discovering Busse. However, even during the down cycles, resale value of Busses has significantly exceeded original price. And in the worst case scenario if you lose some measure of resale value below original price, so what? Owning and using a great knive all that time surely has some positive value. It is almost a no-lose situation.
If you are collecting only for profit, do not put an excessive amount of money in the current production knives which will one day show up again in the production cycle. (IF you are collecting primarily for fun and satisfaction, put tons of money into them if you wish is my recommendation.) Concentrate on the LE's and mil overruns which will not be repeated. Unless Jerry specifically states, as on the LE's, that these specific configurations will not be made again, do not be surprised to see them offered again some day. Buy the new standard (non-LE) models for users and for a representative sample in your collection or because you're in love with a particular model.
I personally will not let my enjoyment of these knives be ruined by sweating
modest fluctations in resale value. When it stops being fun, I'm outta here!