It all depends what the degree is and where they did it.
There are very few degree's these days which allow an automatic guaranteed uplift in your income for life. And even then if you go to the wrong institution you might as well not have bothered.
Also as well there is now a huge divide between scottish students and the rest. Your talking 12-15k's worth of difference over the course( lets call it an IR). The economics of degrees and which subjects are available is becoming a national disgrace. It is even more shocking when you have any insight into the methods and reasons that dictate policy in the higher education system.
Aberdeen is not and hasn't been for the last 35 years anywhere near a normal employment market.