$20 is starting as I understand, and goes up quite high for master mechanics with certifications. That's how I meant that to be read.
$20 is also on the low end for a good tech, you're correct.
$20/hour is starting pay around here at McDonalds, In-N-Out Burger, etc.
cheaper than a degree
>breaking his back and knuckles, and exposed to carcinogens (used motor oil, grease, etc).
They work indoors and don't exactly work in an environment where things get burnt or aerosolized. It's no office job but it's not exactly ditch digging.