This. I am from India. Graduated with degree in engineering from one of the top universities. Worked in US for last 4 years of so. Now enrolled for one of the top MBA program but I am thinking of leaving US after MBA rather than applying for green card. There is so much wait for people from India. Agreed that number of applicants are very large but then 10 years is way too much to be tied to one employer. Time value of money surpasses benefit that would green card/citizenship benefit after 10 yrs.
Also, not to forget in recent years there are increasing number of problems happening in US in every aspect, high tax rates, so it may or may not worth the deal. Again this is my opinion only.