Don't believe that.
Generally yeah more qualifications mean higher paid job.
But i know a few examples.
My bro is 25 owns a few business and has just bought a nmew house, he is dumb as hell and only got a few GCSE's i think.
My mates Dad owns his own business to and he is on about £100,000 and he left school therefore didnt get A GCSE.
Most high paid jobs are specialality jobs, like brain surgeons etc. They shouldnt really care aslong as you are god at that job, but you can argue that to get good at that you need to go to Uni where you need to do have qualifications to get in