Many collectors feel this way. And besides, clampacks are the ultimate in disposable packaging. I can't count how many I've opened and tossed myself. The knife, without any sort of packaging has it's own value both to the individual and on the collector market. The knife, unused and complete in a box has yet another value. And the same for a knife in a clampack. Years down the road is where I believe the clampacked knives will become a much sought after collectable in their own right. Of all the knives sold in clampacks between 1985 and the 2004 auction, what percentage of them do you suppose were opened? And will yet be opened? Even as high as the attrition rate is for the softer boxes, I think the rate for the clampacks will be extremely high by 2014. Resale values are sure to rise, and it would not surprise me to see them pass a MIB example of the same knife. Of course that is only one type of "value". I think most of us will admit that knives suck as an investment if financial gain is the goal.
A group of clampacked knives often overlooked is the NASCAR/Racing clampacks. They were relatively inexpensive knives to start with, mostly SP3 Firebirds with custom handle material colors and blade etches. With them and a few other such CP issues, the artwork on the package is definately half of the lure. These are "crossover" collectables appealing to racing fans as much as to knife collectors, if not more so.
Another group overlooked is the various anniversary knives, both for Imperial Schrade, and for SFO's such as Sears/Craftsman. There were several knives in each catagory which were not available in fold down or presentation boxes or in tins.
Some Ducks Unlimited issues were only available in clampacks as well. When any of these knives are removed from their clampacks, a bit of historical context is lost, IMHO.
Check the value of an early 1960's G.I. Joe doll alone, and compare it to one still in it's cellophane windowed store box with clothes and equipment. You'll be amazed. Point of sale packaging can double the value on the collector market.
Michael