At a certain university...

An administrator suggested that courses should have no more than 20% of students who failed, withdrew, or even received Ds or incompletes. Meanwhile, according to a review of "The Five-Year Party", Craig Brandon

...describes the vast majority of colleges as "subprime," which he defines as any school that has lowered its standards to the point at which almost anyone can pass. There's a college for every student at any price point, regardless of ability or career goals. At subprime schools, Brandon estimates, only 10 percent of students are really interested in academics. The rest are there for mostly social purposes.

The slackers take dumbed down courses in which grade inflation results in 90 percent of students getting As and Bs. Learning is optional, neither required nor expected. Even mental midgets who do no work are too big to fail. Nobody fails. That would make the professor look bad, and the school would risk losing a paying customer.

What's the payoff for students?

A large number of those who do graduate have trouble finding good-paying jobs or end up doing something for which they do not need a college degree. Brandon's conclusion: Millions of people would be better off doing something else with their time and money.

Update
So college teachers are kind of like drug dealers.