This is a nitpick, I know, but its pretty disingenuous to just compare "pre-MBA salaries" with "three years after a two-year MBA salaries". That's a gap of five years: I'd be interested in a comparison of salaries between a cohort three years out of a two-year MBA and a similar cohort that just worked for five years.

(I think that the MBA cohort is still making more overall, but I suspect the value prop is less impressive.)