I'm mostly a Collector and Accumulator. Hardly ever a User, although I do carry most days. Never a Trader.
By "Accumulator" I mean that I buy all sorts of knives and bladed items for a variety of reasons: interest in design, materials, aesthetics, historic interest, novelty, curiosity, etc. I keep these in new condition in order to preserve the characteristics that made the knife attractive in the first place.
In my mind "Collector" refers to someone who seeks out knives to buy because of a specific criteria. Brand, age, national origin, color, shape... Most collectors, including myself, probably keep these in new condition in order to preserve value and "collectibility."
What do I accumulate? It's all fair game to me. Pocketknives, bayonets, khukris, hunting knives, survival knives, Swiss Army Knives, even a few customs.
What do I Collect? USA-Schrade Old Timers and vintage Bruckmann knives from Germany.
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I would guess, from reading similar forum topics, that the majority of BF members are "Users," buying knives for the primary purpose of using and carrying. Also a large number of "Traders" here, people who enjoy the social interaction and educational value of exchanging one knife for another, sometimes a continuous and eternal process of finding the 'perfect' knife.
p.s. Welcome to BladeForums!