Do you have a source for your claim that US teachers make 60% of the national average for someone with a masters in education? (A degree which doesn't qualify one to do anything but teach.)

Average US salary $40,711.61:

http://www.ssa.gov/oact/cola/AWI.html

Average US salary for those with any sort of Masters $53,000:

http://www.salary.com/learning/layouthtmls/leal_display_noca...

Average salaries by type of teacher for their 9 out of 12 months of work:

http://resource.educationamerica.net/salaries.html/