There's too many variables for people to be crunching numbers like this... while I went through university I lived at home and worked at jobs that paid $17/hour minimum. My total take home would probably be comparable to that of a person making less but paying for room and board. I say this with the assumption that those who skipped post-secondary education in favor of a job moved out of their homes almost immediately.

So where are those types of values in the calculations?

Now that I've graduated my starting job is ~$60k with a $20k annual raise once I've been in this position for a little over three years. There's not one friend that started work directly out of school that I can say that for.

Not to mention my degree allows me to venture to the upper ends of this company where education is a requirement while they'll plateau in seniority because of that.

Again, way too many variables and gray areas for us to do a number to number comparison because no two situations are identical and the idea of "average" or "typical" probably only makes up a small percentage of personae anyway.

I'm assuming you graduated with a bachelors? At the end of your BS, it's definitely worth thinking about opportunity cost (eg. is graduate school "worth it"). When I was working toward my PhD (engineering, with goals to eventually be entrepreneur)... I had to fend off detractors: "if you want to make money or do a startup, stop at a MS and get out there." I politely disagreed. Getting my PhD was a personal goal and shouldn't detract from future entrepreneurial activities.

Like you, I lived frugally during my entire educational experience, and the tuition was largely paid for through scholarship / fellowship. For talented people (who could prosper after dropping out), college expenses can be fairly minimal.