Like with most things, the problem is usually that we can't find peripherals that are actually nice, rather than overpriced (and endorsed by shills). If the options are paying 40$ for a shitty keyboard, versus paying 400$ for a still equally (if not more) shitty keyboard, the choice is pretty obvious.
I don't know about anybody else, but I spend 8-18 hours a day attached to a mouse and keyboard. I'm not going to use one that doesn't feel good to me.