For instance, you did it in this very post. Do you really think that all high school teachers are locked into making $40k for life? Here where I live (a large city, but also a pretty affordable one), teachers start at ~$55k in base salary, get a whole range of benefits including a pension plan, actually really do have the summers off (plus numerous other breaks), and leave work at 3:20 PM every day. If you were to have them work year-round and go home at 6-7PM and convert the pension plan into salary, the salary would easily exceed that of most entry-level engineers across all disciplines in the area. When I graduated college, I had engineering friends being offered salaries in the $60-70k range for considerably less stable jobs, much longer hours, virtually no time off, and much fewer benefits.