I finished school in 2003, didn't start my apprenticeship til 8 years later.
I'm not saying no one should go to uni or whatever, but most of the people that use the example you used above, forget to factor in the money they weren't making for the ~4 years they were at uni, so unless they're on mega bucks when they do get out, they won't be catching up/overtaking those who worked from the get go anytime soon.
Of course money isn't everything for some people, so it's not much of an argument, but for materialistic mother f**kers like me, it's pretty much everything