Funnily, the only persons asserting the value of diploma ... are PhD in ivy league business schools... selling expensive diplomas...
Education is probably a large scale scam in its actual form: too long, too expensive, counter-productive and overrated.
Cf Henri Mintzberg essay on why MBA for instance are a poor choice for being innovative.
"M.B.A. programs train the wrong people in the wrong ways with the wrong consequences," said Henry Mintzberg, a management professor at McGill University in Montreal. "You can't create a manager in a classroom. If you give people who aren't managers the impression that you turned them into one, you've created hubris."