There are further implications along these lines, too. It’s isn’t just ability, but willingness: at least some prospective teachers would probably be put off by the prospect of being required to be armed in the classroom.
Not that the job market for teachers isn’t glutted, right now, but is “willingness to carry a gun and shoot to kill” really something that we want to select for, in teachers? It would compete with the ability to teach well in determining who actually teaches our children.
I work for Smarthinking (also as a writing tutor), and it only pays $12/hour if you have a Ph.D. If you have a Master’s degree, $11/hour; a Bachelor’s, $10/hour.
For what it’s worth, they are reliable in supplying work hours, which is nice, and the work isn’t bad.
ETA: Although they advertise and accept applications year-round, I have a suspicion that they hire/train new people only during the summer. I have only extremely limited data on this point (myself and one other person who both applied in the fall to be hired in May), but it seems worth mentioning as a possibility to be aware of. Alejandro1, what was your experience?