I'm personally a keyboard hobbyist so this doesn't apply to others but the device I use most in my entire life is actually the keyboard. I work a computer job and play games, so that makes sense. So, a premium keyboard that's going to last me forever is well worth it for my needs since the enhanced experience really makes working and gaming much more enjoyable.
Things that go into the price of an expensive keyboard are not just the switches, but the quality of the build, mainly the case and especially the keycaps. Most cheaper keycaps will use thin, ABS plastic that has that greasy, shiny look over time and likely have a cheap casing overall. If you're into lights, that probably adds to the price as well.
All in all, premium keyboards are not necessary, but are pretty nice if you get to try the right ones
