I can't help but wonder if the consumers are getting their monies worth, or simply a degree along with debt.
That is a very good question. There are existing numbers to answer it.
One process is as follows:
1. Find the average income in the US of, say, a 30 year old white male with different levels of education, e.g., high school diploma and bachelor's degree.
2. Find the prime lending rate, from public sources.
3. Factor in the unemployment rate and the mortality rate, again from public sources.
4. Assume that people retire at the standard retirement age.
5. Find the income tax burden for each of the incomes.
From these numbers, you can estimate:
1. How much additional income a college degree will yield.
2. How much additional income tax revenue a college degree will yield.