The reason that everyone tutors now is that the job market has changed.
Once upon a time jobs were:
Professional: Paid a good salary, no overtime but might be benifits such as company car. Eg Lawyer, business executive. Jobs through nepotism or University. Might be able to work your way up from shop floor in certain industries. Pay increased throughout your working life.
Skilled: Hourly paid, benefits such as overtime, holiday pay negotiated by a strong union. Good salary after your aprenticeship, unlikely to increase much during your working life. Nepotism in certain industries, eg Film for some roles.
Unskilled: Poorly paid, very little job security, little chance for improvement.
In Slough with it's Grammar school system it was better that your nice but dim son, went to the local secondary-modern, left school at 16, got a trade and was earning good money by 19/20. Very few people tutored because the wrong kid in the wrong school would never work and a decent salery was available through other routes.
A huge chunk of those skilled, well paid jobs have gone, hence the rush to get to University.
Eton school boys were all weird and really looked down on by my school, posh boys, bought brains, never thought they'd get anywhere. Never miind the tutors it's Dad's money that really gets you places.