Plumbers make good money, but probably not that good of money.
As someone who started out as an electrician, skilled trades can make you lots of money. Not so much in just working hourly, but if you own a business, become a contractor, yes. You're very easily in the bracket of your highly-paid executives.
It's not an easy life. You have to run a business with employees to get to that level, and all the headaches and hustle it requires.
The frustrating part is when you're trying to work a trade, just as a "job" because maybe you have other interests in life other than dedicating your life to running your own business, it still becomes difficult enough maintaining your own tools, usually a truck, other expenses, that it often crosses your mind that it would be easier stocking shelves or working in a warehouse somewhere. This squeeze is especially true in big cities, and why there is this perception that illegal immigrants are "only ones" who will do infrastructure work.
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If I was Apple, i would come back to Detroit, they use to have a office there back in the early 90's. And with automobile automation would be a good place. Plus having all your technology along the west coast. Subject to earthquakes, tsunami's. forest fires and disasters. Spreading your tech across the whole united states might be a good idea.
I grew up in Michigan. Plenty of sand. I would love the idea of factories built there which turned raw sand into silicon.
Steve Jobs himself complained. He said the education system wasn't training people with the skills needed to do basic manufacturing. He said that was the number one problem he had trying to locate manufacturing in the USA. He talked about griping about this directly to Obama.
The problem with Detroit is that while it once had a manufacturing base, those jobs left and those skills left.