If it wasn't worth it, most people wouldn't do it! I do know a bit about the Indian scene, but look at it this way, people are coming from great IT jobs in India with what? 30K salaries? something around there? If you get into a school in the Top 10, you more than triple that salary, plus bonuses and all the rest.... not tooooo bad right??? As you go down the list of the rankings, the postMBA salaries go down, but then again so does the tuition! So it might make sense for you even then.
The easiest way to figure it out is to do the math - look at average MBA salaries in YOUR INDUSTRY of a school you feel like you are likely to get into, and do the math including tuition and lost opportunity costs over five years, then over ten.. and see how it works out for you!