In 1970 the average wage was $6186, in 2009 it was 40,712. A 6x increase, where school costs only increased 3x. SSA source of data
I'm not saying we are getting sufficient education for our money. But to show the costs disparity over 30 years without any frame of reference is misleading.
That number is adjusted for inflation: The figure is in constant 2009 dollars.