I don't understand why some folks are wary of classifying themselves collectors. Your stockman "accumulation" alone is a collection in my opinion.
A collection is simply an accumulation of things. A collector, one who collects.
I don't have a strategy. If I see it and I like it, I buy it assuming of course I don't have to mortgage the house to do it. I buy what I like and don't care about what something might be worth in 10 or 20 years unlike firearms.
Added: I tend to like Trappers or "jack knives", but there is no theme to the buying.
I'm not a collector but have accumulated a few folding knives, most of them within the past six months even though my first knife dates back to the 1960's, so depending on how it is defined maybe I am a collector.
If I like a particular knife I buy it and I too am partial to jack knives and stockman patterns but not to the exclusion of anything else and my "collection" runs the gamut. Now if I include kitchen knives, then I am definitely a collector but all my knives, kitchen or otherwise are users.