Second, if you go to places like Netherlands, Norway and Japan you'll see that it's not about money. Higher education prepares workers to do more complex, more efficient and more productive jobs.
Also, the society is more conscious about not having someone to do stupid things for them like collecting their trays after they eat at the McDonadls, this is YOUR responsibility as a member of a society, to look for others as well.
So in Amsterdam for example, street cleaning and trash collection are done with specialized vehicles. In Denmark, subways are autonomous.
I like to believe that as you increase education and income, the people that would be considered "dumb" in an very unequal society will spend their time developing technologies to automate tasks no one likes to perform and increase productivity.