Well if by use them you include holding, fondling, admiring, lineing up on my desk, showing people, sharpening, etc. I have 50-60 fixed blades (new) (and 75 old blades that stay in the closet.) I only have one knife I have not sharpened or cut anything with. It is a mint, old style (pretty handle) Rat Mastiff. My EDC is either a SAK Trekker or a BM D2 Griptilian. I have a BRKT Sandstorm A (12c27 steel) that is always in my pack. I have a dozen or so Mora Craftsman scattered in my cars, boats, packs, tool boxes, etc. I own maybe 6 packs and each one has some kind of "survival" knife. I then add an outting specific knife(s) to each event. Also, I have a "possibles" box that goes on all outting that includes a DF. altogether I have 16 Busse Family knives and 13 BRKT knives. Those two groups get most of my "love" (and money). The one exception is a bowback skinner (Sharp Thing II) I got at Blade West from Okuden that seems to be a perfect hunting knife.
Ron Athay