I don't know whether everyone goes this way, but I know I did. Started off with a SAK Farmer, which I still carry today. Tried a BM Minigriptilian, wasn't too fond of it, went on to Spydercos (which I still have an appreciation for, love that Caly Jr). I decided to go for the big one and bought 2 Sebenzas simultaneously. Once I got them, can't say I was too impressed, at least not much more than I was with Spydercos. I knew that I reached the apex of tactical style knives at this point, and it possibly wouldn't get any better, so I went back down to slipjoints. Turns out I love slippies, really dig my Schrade Old Timers, Cases, Queens, etc. Never felt the need for a lock either, and when I did, the RAT comes out to play.
I thought it would be cheaper. Alas! It isn't...
I'll say that this only applies to folders. I love my fixed blades (RAT Izula and RC-6), never felt the need to get any other fixed knife, tactical or not.