no one ever went broke underestimating the intelligence of...

no one ever went broke underestimating the intelligence of...

The full saying is "No one ever went broke underestimating the intelligence of the American people/public," or some variation thereof, meaning that people being swindled won't realize or question it, which makes them a prime source of income for others. It is typically attributed to writer H.L. Mencken. A: "We can't sell this shoddy product to people!" B: "Oh please, no one ever went broke underestimating the intelligence of the American people."
See also: broke, ever, no, one, underestimate
Farlex Dictionary of Idioms.
See also:
  • underestimate
  • come from far and wide
  • chief
  • (there are) too many chiefs and not enough Indians
  • along the beaten track
  • beaten
  • a couple of (people or things)
  • couple
  • couple of
  • big and bold