you can defiantly get 104 key mech boards, and 120 key mech boards are easy to find if that's your thing. With that said, when you're paying $1+ per switch, there's a a good chunk of the market that doesn't mind saving the $40+ to have the extra keys removed. Adding keys to a cheap board is an easy way to add functionality, but once you pay to have customizable firmware, it's just as easy and cheaper to put those keys on a layer.