As an Ivy League MBA myself, I can tell you the analysis that I performed that made it a no brainer for me. I was almost FI, as a young single man, but looking ahead realized that I wanted to have a family and that my savings were not enough to be FI with a family. Looking at the salaries as an Ivy League MBA, I knew I could just about double my existing salary. My living expenses during grad school were taken care of, because I was already somewhat FI, so my debt was only for actual tuition and books. When I returned to work, I primarily lived off of my FI income and applied my entire income towards student loans killing them off in a little over 2 years.
In addition, having the MBA from a top school made me more marketable on the dating circuit, and I was able to marry a brilliant woman who earns even more than me, and rivals me in her mustachianism.
So, now I am in the situation where I have the degree, loans are paid off, I am essentially FI if I want to be, but am working because I enjoy it and my savings are growing exponentially, because even with kids I am socking away a tremendous amount of money, which only makes me even more FI, if there even is such a thing.
I think life is a balance. If you are young, and intelligent enough to get into a program like Wharton, and committed to keeping your expenses low after you graduate, the loans will get paid off extremely quick and even one or two years of savings past this point at the higher level will more than make up for the 2 years of school and the 2 years or so of paying off loans.
However, if you are already making close to a 100K now, it might not make as much sense because the incremental benefit of going to grad school will be much lower and it could take year many more years to recoup your expenses and the opportunity cost of not working for those 2 years.