I like most when I got my first customs did not want to scratch or hurt them, but after talking to most of the custom knifemakers I have bought from they said basicly they are tools made to be used. It changed my whole outlook, and since then carry, and use any customs I buy. If they are to too pretty to use then I don't buy them. Besides I want to enjoy all the fantastic steels, alloy blades that are in the knives I buy. Pay good money for those knives, might as well enjoy them. I am not a collector in the sense of the word as for reselling. I figger what they are worth after I am gone is immaterial, and does me no good anyway.
I use them but don't abuse them. I like most carry more than one knife, some for hard use, lending to someone else to use, but my customs for light use, and NO-ONE handles my customs. If they did not buy them they will not be careful enough to not abuse them, drop them, or scratch, bend, pry, etc.
I say use them, and appreciate them for the high quality of workmanship they are built from.
Sorry this is so long, but you asked!!
Just my .02 cents rounded off to a buck.
Larry