I just bought a monitor arm that has a USB dock at the base. The dock is actually just a USB extension cord that is enclosed by the base of the arm. Think of it like putting a $10 USB hub into a box and poking holes in it to stick wires through. Great teardown, makes you wonder what's truly inside these boxes.
In other news, I do think desk makers should start incorporating the USB dock inside the top board of a desk. People go through a lot of money and bullshit to keep their setup clean, especially those who swap computers.