Same reason I don't use a screwdriver to remove a 12mm bolt. Same reason my tool chest is 6' tall and same reason why I have several different 1/2" drive ratchets in my ratchet drawer.
Started out with Stanley or generic "chrome vadium", Husky or what have you. I still use Stanley pliers for their comfy handles. But the big names for stuff that has to last when using leverage on high torque stuck on bolts are used.
Same for flashlights, the $3 multi LED light will still get me to the toilet at 2am, but it would be useless for SCUBA diving or attached to my shotgun for night vision of items 300' away, outdoors.
Me, personally I don't automatically go after name brand stuff because it's good. Several of my hot rod friends and my mechanic (with 50 years experience) use Harbor Freight floor jacks. I use Craftsman. Not because it's a Craftsman, but because it is portable enough to fit in my trunk and lifts the car just as high.
So if I buy a Sure Fire, it's because that light does the job I need it to do. I have several brands and styles of flashlights. Cost is way down on the list of pros vs cons.
Matter of fact my hot rod that outran the vette when new was made by Honda. Half the engine size, but ran faster in the 1/4 mile and was the 4th fastest car at any price anywhere on the planet on the slalom course, but new was 2/3 the cost of the benchmark vette.
So my light collection has numerous versions of Coast lamps for the same reason. My 201 lumen HP7 shines 1000'. I needed a light that shines items brightly a football field away, fit easily in a pocket of my safety vest and bought that one for those features. But as a bonus it zooms in for a dandy flood light, holds up when dropped and still works after using it in the rain.
I considered the LED Lenser, but for less money got a better light with better features and extra batteries for less money. Does it have pure this and perfect that? Nope. But when I push the on button it lights. And it illuminates the things I need to see NOW, not when I'm done evaluating the tint or the border of the beam.
Aaaaaand it's kinda cool to activate the strobe to see if passers by suddenly fall over and start lurching about in some kinda strobe induced siezure.
One more thing. My mechanic has over $200k in his wall size tool chests, but he uses Gear Wrench ratcheting swivel box ends when his $35,000 Snap On anylizer reveals the problem is that hard to reach alternator or what-have you.