I assure you that the difference between a $2k and $20 grinder is vast. Reasonably competent, usable espresso grinders generally start at hundreds of dollars and go up from there. If you can figure out how to make a good one for $20, you’ll make a fortune. Same goes for the machine.

a programmer would be offended by "$100/hr for a 2.99 smart phone app?!"

those expensive grinders are usually machined in house by small teams.

though, i do absolutely agree that there are many coffee things that are way overpriced because of the rest of the market.

Particle size matters for coffee, and at $20 you couldn't even get a hand grinder that produces good results.