One column would be university. Another column would be course. Third column would be price. Fourth column would be field of working. Fifth column would be median salary (monthly earnings for entrepreneurs). Ideally that would be lifetime earnings instead, but it's really hard to do.
There probably should be a column for employment ratio or one extra entry per (university, course).
Then we can easily query such database to measure impact university has on financial success. And stop muttering. There still would be people who don't act rational, but at least we can mark it as such — irrational, instead of wrong. What I'm afraid of is that people will still act irrationally while thinking they are acting rationally (e.g. "of course they never succeeded, they were not as talented as me!")
I think someone would even pay to have access to such database, so there is probably a business opportunity here. Although, even more probably most university will disagree to disclose/outright falsify income numbers, because they are not interested to tell the truth.