2 points:

1) The blog touches on it, but can you imagine the temptation of shady (and non-shady) companies out there to try to engineer a cheaper version or to cut corners to gain some of the margins charged for such a seemingly-simple piece of hardware?

2) Do you remember 20 years ago, 5-10VDC power supplies for computers used to be this gigantic ugly black brick with cooling fins that weighed 2 pounds and had embarrassing Apollo-style connector plugs? Amazing what miniaturization has achieved.