It should be said that flashlight collecting/using can be very dangerous to the bank account. Possibly moreso than knives, but that depends on the user. The problem is technology. There will always be new knives, and new steels. But the latest supersteel might offer a 2% increase in performance over another, which might not justify the purchase of a new knife. However, LED technology is still so new and evolving that if you have one that's 3 months old, it might be obsolete. If it's a year old, it's definitely obsolete, and if it's a couple years old, it's ancient. Every few months a new LED comes out that offers something like 5-15% increase in brightness/efficiency. That means ever year or two you get double the brightness with the same battery that you used, with the same runtime. Believe it or not, but Surefires are often considered dinosaurs, because they're not as up-to-date as other manufactures, although their quality of manufacture is second-to-none. If you're the kind of personality that has to have the latest and greatest, flashlight collecting can be very hazardous to the bank account. Companies like Fenix, 4Sevens, and JetBeam are the frontrunners when it comes to new tech, or they're the enablers to your addiction. It depends on your perspective.
The flashlight on my keychain is a $300 custom titanium one. And it's a few years old, so it's obsolete, so I'm looking for a replacement. If that doesn't say something about the flashaholic condition, I don't know what does.