Its really subjective, as far as cost. Are they worth more? Perhaps to someone that wants to pay more.
The BK101 is probably the most rare of the bunch.
My thoughts on the BKT Desert series, are they are not worth what some folks are paying for them. The handles are painted, and the blade coating is pretty much the same, epoxy painted.
As for asking the price, you can't really ask that since you are not a gold member. I do apologize, but that is BFC rules, and membership has its privileges.
I would say, don't spend too much on them, unless you are looking to increase your collection, but if you are wanting users, look to the new blade pricing as a guide.
Oh, and the BK10 will be coming back into the normal production line.