At some point, the populace felt keyboard shortcuts were enough and they have everything else they need on a keyboard. It's the standard, other keyboard designs didn't really quite take off, and most people can barely use a full-sized keyboard anyway.
Some people prefer smaller keyboards, and are willing (and wanting) to have more shortcuts and function layers for ergonomic and desk space reasons.
(If you use a 40% or smaller keyboard, you're weird, and I love/hate you.)
Some other people use so many shortcuts that it becomes so infeasible to remember or press them all, so they get macro pads, or even entire additional keyboards to function as macro pads.
that'd be $4400 and $6000