I just saw the Kickstarter[1]. The margins on these coat hangers look so good that it'd make NVIDIA blush. [1]: https://www.kickstarter.com/projects/simonegiertz/coat-hinge...
The margins are likely not that great. Small run hardware manufacturing is extremely expensive. It's not until you are doing volumes in the millions, the factory has invested in custom tooling, and you're buying material by the truckload straight from the manufacturer that prices really start to collapse. Right now she is probably getting the steel off the shelf, the plastic pieces from a small shop, the forming from…
She mentions in the video that the plastic pieces are injection moulded over the wire, that's a clear indication that it isn't all done by hand. This is very likely being manufactured in a factory in China, with a 1000-2000% markup. But it's got a great story attached to it, and that's what sells it.