I think it is mostly because they don't understand how much better wired internet is than wireless. I've basically forced many people to connect their devices with Ethernet as a "temporary" measure to solve their problems. For the most part, every single person has decided to leave whatever it is connected.
Yes. Same here. Ethernet is an oddly underrated technology. And Monoprice is one of these things that nerds know about and no one else does. There may be other companies like that—someone above mentioned an enterprise router company that sells better stuff than most consumer companies. Yet I've already forgotten its name.