Unfortunately, most of us live lower on the A/P food chain than you.
First rate A/P's work for the airlines, and get great salaries, and benefits.
Second rate A/P's work at large FBO's, and get very good salaries and benefits. They make occasional minor mistakes.
Third rate A/P's work at smaller airports and repair facilities, lower salaries, and are not as skilled as the above.
Those third rate mechanics make occasional mistakes, but are unlikely to be fired because the pool of replacements are mechanics that have been let go elsewhere, or neophytes who need a lot of training to become skilled enough to earn the A/P rating.
The thread of JimK's about his engine probably represents an example of the problem.
Unfortunately, many owners here have been in terrible corners when the shop does not have enough mechanics to get to their repair done within a year or more.
Skilled mechanics don't just appear when needed, and $140 charge per hour does not represent the hourly pay, costs to the employer are generally more than half the labor charge.
At my employer, my salary was 40% of the actual cost of having me on the payroll. They preferred to pay double time rather than hire a new employee. So if that FBO charges $140, that mech, if working alone, is probably getting about $56 before taxes, and $40 after taxes. That is about $83,000 a year. If there were 2 guys working on that plane, half that wage was being paid, $41,500 a year.
The GA guys have to put up with what that tier of mechanics is, not what it should be.
You have the privilege of top tier mechanics, highly paid, and very competent, consider yourself fortunate.