Im with Stumpy, I would love a look at the rules of appreciation and depreciation regarding custom knives.
I wish someone would write a book on how to buy custom knives.
Stumpy, if you want knives that will appreciate in value. You have to do your homework. Current demand may or may not be a forecasting indicator of future demand.
A knife maker who builds few or only one of a kind knives may or may not be an indicator.
Market position, Qaulity for the Money, Aftermarket demand, business practices and ethics will all enter into the equation.
Short term smaller gains are easier to forecast than long term bigger gains.
You need to understand what you risk aversion level is.
Most custom knives do not appreciate in value. This is for two basic reasons.
1) Most custom knife makers do not view their knives as commodities that will trade in the future for more or (usually) less money.
2) Most custom knive buyers do not view the knives they buy as commodities that will trade in the future for more or (usually) less money.
It is the buyer that utlimately drives the trends and the aftermarket. Most buy what they "like". Some buy with investment potential in mind. These individuals may or may not buy a knife they really want.
As for the value of Allen's knife. Just email or pick up the phone and ask him what the knife sold for originally. Then do a little checking on the different forums.
Good hunting!