My experience.

MBA while mid-30s.
Changed industry 2 years after. Income was double.
Went from a MNC sales role (asset mgmt) to MNC management role (MD - financial services).
2.5 years after changed jobs again.(MNC, MD - regional role)

Noteworthy, all employers after my MBA were firms and contacts that I had before my MBA.

So my lesson was, "it's still not what you know, but who you know (when you learnt what you need to know)".

Did my MBA help me change industry/roles - yes.
Does it help me in my current role now - a little.

Alot of people wothout MBAs place it on a bit of a pedestal.
After completing one (uni ranked top 100, so not the Wharton's of the world) i wouldnt rate one that highly.

It was also the easiest post grad that i earnt. But least utilised.
I think my CFA was way, way harder, and more practical.
That said, the MBA increased by worth in the eyes of future employers, which was its objective.

So was it worth it? - I have to say, yes!