(I had written a bunch of stuff here but decided it wasn't helpful)
One comment I will make is: My favourite lecturer in my Masters course (Master of Applied Finance) refers to an MBA as a degree in Whiteboard Management.
Thinking about it a bit more seriously, I don't think this forum is particularly useful for you for this question. We tend to deal with more direct IT level discussions and your goal is (by the sound of it) outside the IT relm in general and more into the Boardroom and Business world specifically. Perhaps (for this question) you should look for forums that lean in that direction?
(the reason for this is that I for instance would never consider doing an MBA but this may or may not be because I have absolutely no interest in aiming as high as you. I am happy with the career path I have that keeps me at the coal face.)
Good luck though!
"Not every solution was derived to address an obvious problem" - Me (quite recently indeed)
In my particular case I can tell you having the MBA has helped my career path... sad but all some folks focus on is letters after the name.
The fact that my MBA is with a concentration in Risk Management Insuance has helped me significantly as I'm in the Insurance Industry and was a Business Analyst...
All in all, it has some good attached with it. I personally don't look for it when hiring, neither do the other managers here as often times actual experience is better. If you have both, more power to you!
You ask "my question is how much MBA degree have influence for my career growth, should it be necessary for me to have an MBA to go into top management ladder".
Well, certainly it's not necessary - many folks have climbed the corporate ladder without an MBA.
I have an MBA. It has turned out to be useful in a few startup companies, where my MBA helped make the (very small) companies more attractive to investors.
If you obtain an MBA from one of the highly respected business schools (MIT or Harvard, for example), you'll have lots of important contacts that could certainly open lots of doors for you. I got my MBA at a much smaller, less prestigious school.
Other than that - more education is usually a good thing. I learned some good things in my classes leading up to the MBA. The degree itself is secondary.