Earlier quoted context omitted.
For plumbers, electricians and a few other trades you can become a journeyman apprentice in the US, and after a few years you can earn high 5 digits to low 6 digits with healthcare usually. That being said, its a mature industry and not highly regarded in the US as it is a "blue collar" job. Stigmatizing & devaluing an honest days work is ridiculous to me, but that is what our society has done to these jobs.
So is it just the stigma that prevents people from getting 100K a year? I mean if it's as easy as it sounds in your comment, there should be loads of people signing up. And I'm guessing you don't end up with 80K+ in student loans?
There are a plenty of things that play into decisions like these:
1. 100K/year doesn't necessarily mean you get some fixed income every month. Not everyone enjoys that kind of a lifestyle.
2. Feeling of doing a lesser intellectually involving work.
3. Perennial threat of facing impending dilution in wages, as you are working in a area where people have a lower barrier to entry.
4. Other social respect problems. You likely won't get as much attention in your circles as some one is who working at Google.
Many other things...
By and large you will still be better off with a job that pays you a fixed income every month.