Apart from kitchen knives I only own one knife, and I've only owned one at a time for the last few years. I used to have a collection of a dozen or so folders constantly rotating through trades/selling/buying, but I would mainly stick with inexpensive knives ($30-$70 range). I found myself carrying mainly one knife for my EDC needs, a Case Swayback Jack in CV. I didn't really use my other knives and I needed money for other things, so two or three years ago I ended up selling everything except for that one Swayback Jack. I carried it exclusively for a year or two and then gave it away on the forums and carried an Opinel #6 for a few weeks. That knife somehow got lost (and by "lost" I mean "probably stolen," I simply don't know by who) so I started carrying a Blind Horse Knives Snapp Knapp for a few weeks. While carrying it, my brother found my Queen Country Cousin in his car (after being lost for over a year). I prefer a thin blade that slices well, and with the Country Cousin having a thin blade convexed by a previous owner and with the Snapp Knapp's main drawback for me being its 1/8" stock (on a ~2.5" blade it's a bit thick for me) and the thick grind, I gave away the Snapp Knapp and have since been carrying the Country Cousin alone. I'm now giving away the Country Cousin (yes, that's right, I'll actually own zero knives for a short period), and I think it's about time to start a collection back up, so the title of the thread will only apply to me for a short while more.
After whittling down my collection to just the Case Swayback Jack, I realized one knife of the right size and cutting abilities, and with decent steel, is enough to get by. It wasn't rough going, one knife served all of my purposes just fine. I realized quality over quantity is what counts, having a dozen inexpensive knives with mediocre materials isn't any more satisfying to me than owning one knife I really like. That's why I'm starting my next collection with a different mindset. Instead of cycling through inexpensive knives quickly (which does have its benefits, I was able to pinpoint the features I really cared about, the patterns and materials I cared about, the right size blade for me, etc.), I'm going to take the slow road and stick with quality stuff. An S30V/G10 Leek, ZDP-189 Delica, Gayle Bradley Air, Ritter Grip, Fallkniven U2, etc. are all on my list and will all be in my collection soon. I also realized I haven't carried a one handed opening knife for years now, and have a strong hankering to remedy that. I love slipjoints, but it's about time for me to get some tacticals back in my pocket.