Obviously still ridiculous when talking about charger safety but it’s important to remember we only see one side of the story here. Who knows what actually happened. I’ve worked with talented EE engineers on the client side complaining about how the contractor fucked up a board layout, wired things up incorrectly, or swapped out for cheaper “equivalent” parts that were out of spec in some incorrect way.
Branded siemens, and ericsson chargers for phones were $100+ circa 2001
If this charging block was from the Kindle, you're looking at significantly higher volume & several years of advances that drive the cost down. Additionally, since everyone has shifted to stock USB chargers, all chargers have gotten drastically cheaper due to scaling. You can buy a wall USB (C or A) charger for a few $ MSRP which means it costs like 20-50 cents for the components that go into it.