I don't know what it is about knives in general (really folding knives specifically) that I go so gaga for...but I do...it just hits a special pleasure spot in my brain that makes me very happy!
I got my first knife at about age 7 from my grandpa. It was just a little folding Buck or Case (like a Peanut or something similar sized). It was his & I wanted it so he gave it to me (grandpas are great!

). I had that knife until I was about 12 or 13 then LOST IT!!
I have never forgiven myself. I can still remember the last time I saw it/had it. After losing it I looked for it endlessly...no luck!

I would trade all my knives just to have that very one back!
Oh well...anyway, it sparked a love for knives in me early on. And even if I never really had a "collection" of many diff ones until relatively recently, I always had a few (SAKs mostly) and just dug them nonetheless!
Then I bought my first pocket folder, a Kershaw Vapor I (with AUS6A steel no less

) and carried it daily for over a decade. Beat the hell out of that knife (still have it). So I guess I'd have to say it was a combination of my grandpa's knife and that cheapo Vapor!