Hi, I'm NeilB and I'm a steel snob.
That was only partly tongue in cheek as I really do enjoy the premium steels and I'm prepared to pay for them. Still, I have a number of knives in 8Cr13MOV, AUS-8, and yes, even 440C. ;b
But, I really like my D2, S30V, S35VN, S90V, S110V, M4, M390, Cruwear, VG-10, and XHP. I'm also a fan of AEB-L, but I'm not sure I'd call it a "super steel". Probably "premium" describes it best.
Really, what I've found is that I just like knowing what kind of steel it is. I'd also like to know more about the heat treat process and I'd like each of my blades to be hardness tested, but I'm a geek; I like that sort of thing. I don't expect others to necessarily share my particular obsessions.
I've also found that I will buy a knife just to try a new steel. I'm hesitating to pull the trigger on a Spyderco K2 because of the well described quirks of the design, but I can feel the 10V calling to me! Fallkniven also has some sweet powder metallurgy knives I'd like to try at some point. If I were back working contract instead of direct and if I didn't have a girl in college, I'd already have tried all these and more!