I think there's a variety of maybe misconception? Between the male ego of simply being able to afford it, to the ignorance that that custom gear makes them a better shooter.
No one NEEDS a 1lb trigger. It only compensates for a problem you already have. For a .30 cal cartridge, a muzzle break doesn't help you to be a better shooter. Sure, it can dampen the recoil, but it's not a fix for bad technique. My point being is that a good shooter can take a stock rifle that is reasonably built and max out its potential. If you are using gear for a special purpose that's a different story, if you know how and why you are using what you are using, and it fills a void. If your abilities as a shooter is good enough that one feel the need to have an custom/accurized rifle, a custom rig can allow you to squeeze every last bit of accuracy out of it. Unfortunately a lot of factory rifles still shoot better than the average shooter.