I used to hang around JerzeeDevil a lot more, and there's a big Balisong crowd there. I wanted to see what it was about and picked up a quite handsome used Benchmade Morpho to give them a shot. I was very excited to hone my bali-skills and got started right after I opened the box. Once I had cleaned my blood off the knife, I promptly listed it for sale.
Also, I suppose another kind of knife that completely escapes me is the "traditional" knife, or any knife without a pocket clip. I'm not going to have it loose in my pocket, nor am I going to carry a belt sheath, and I don't see any reason to carry a knife that takes two hands to open when I can legally carry knives that are fully operable with one hand.
While traditional knives are more "gentlemanly," and I can see the appeal in that regard, I see them as functionally inferior and can't get over that aspect. Slippies are growing on me, though, ever since I picked up a Böker Subcom 42 slipjoint. Neat little knife. Still operable with one hand, though.