As a 30-year educator, and one with 7+ years in the business world, I can tell you without question, "You get what you pay for." Every state has the exact same issue; schools have privatized every aspect of education that they can, under the guise of "wisely spending our tax dollars". When sub jobs go unfilled day in, day out because few will work for that kind of money, it's pretty obvious that the money is not nearly "market rate", at least not as far as putting quality bodies into classrooms is concerned. We've had subs that come in with pajama pants on. No joke. We've had subs who believe that their job is to be on their phone all day, looking up occasionally to make sure no one got stabbed, I guess. Once in a while, we get a real good one. They don't last long, as someone will hire them as a long-term sub or as an a full-time teacher.
Oh, well, this is the American educational system. We want the Harvard experience, but we won't even pay WalMart wages.