I don't collect them, I accumulate them. I probably have fifty or more in various drawers, boxes, etc. I have a several Bucks, some Brownings, Old-timers, Schrade, etc. I have an old Puma Prospector from the late 70s or early 80s I must have skinned 40 deer with. I used to carry mostly the old Stockman type knives, in what I guess they would call medium and large sizes. I have been carrying a pocket knife for about 55 years, since I was six or seven I guess, and invariably, if I happen not to have one in my pocket, I need it for something.
Here's one of my favorites, both the particular knife, and the size: