Do a CMA. Two moderate difficult exams. $500 investment . Three months preparation. http://www.imanet.org/docs/default-source/salary-survey/us.pdf?sfvrsn=4
CPA will do the trick also. If you have a JD/CPA you can teach taxation at a university, where salaries start in the range of $100K to $160K. A masters with CPA can also get you in the high five figures in academia as a lecturer. Accounting is perhaps the hottest field in academia. Young bucks with PhDs in accounting from highly-regarded universities can literally start at over $150K a year.
I've been toying with the idea of getting a CMA for a while, though the CIA (Certified Internal Auditor) would be more closely related to my current job. The CIA is a three exams, and I hear they are pretty difficult.
There is a small army of waiters and bartenders making six figures on the Vegas strip, and probably a few hundred cocktail waitresses making well over 200k in the day and nightclubs. The real question is do the people in the op's link really love what they do? Because money can be made anywhere... finding a career you love is truly priceless.
I would dare say that there are many more jobs that that provide a $100k+ salary without requiring a PhD than there are jobs providing a $100k+ salary that do require a PhD. Heck, lower level HR managers (i.e. Staffing Manager, Benefits Manager, HRIS Manager, OD&T Manager etc.) at my company are compensated in the high five to low six figures.
With a bit of overtime, you can easily make $100K with an Associate's degree (or 60 college credits); Benefits & Salary Overview | NYPDRECRUIT.COM
I can't remember if it was the New York Times or some other website, but they made an online calculator based on zip code to determine what you need to make to be considered "middle class." In my area, I need to make around $120,000 to be in the middle.