you need at least $40k - 45k for a semester to do MBA from top B-schools. If you have a saving and your wife is earning good money and If you do not have to send home money. Go for it. You will be done in 1.5 - 2 years. Full time MBA from top school is not a joke. Time and dedication is very important. Do not think about the job at this time before finishing MBA. First you have to survive the MBA assignments. You even have to go abroad to do business analysis of different companies business strategies.Top school MBA is harder than your full time job.
If you already got accepted, i think you will survive. Good luck.

Engineer with MBA degree
Lawer with MBA
Scienc with MBA is a plus. These people are already getting high salary jobs. But sometimes for promotion to be a director or VP they require MBA degree. 

on the other hand if a bachelor degree in any field with 1 month training in IT gives you $80k salary who will go for MBA?  After MBA your salary might be $120k.