I'm not sure of the 60 to 130k estimate, but that is a lot higher than most I know of, assuming you are still working and the majority of cost assumed is for tuition and books. My guess is that is for private school programs and includes room and board.
The Harvard MBA tutition is currently around $44k per year (room and board can double this, but for the purpose of this discussion, I would assume you are working/going to school nearby)
State colleges for in-state students are considerably less - here in Georgia 8-10k on average.
So assuming one continues to work, and the incremental costs are primarily tutition, books and perhaps auto expenses, I think a more reasonable estimate is closer to 25k, giving a much shorter ROI.
Ostensibly if one is interested in what an MBA offers they are also interested in the business/operational aspects vs just the technical aspects. Like many (most?) degrees/certs, an MBA can be the differentiator that helps you stand out and get that next job. It sure won't hurt, but how much it helps is upto you.