I came to this country (US) more than 20 years ago. The I.N.S. (Immigration and Naturalization Service) were as big dicks then as they are now. Nothing has changed. It's just plain old government bureaucracy; but in this instance, their clients can't vote either, so there's no fear of a backlash.
And yet, despite the INS's dickitude, the country churns out startups like crazy.
Why did the founder of Chatroulette move here, instead of China or India? I'll give you why: pound for pound, it is way easier to come to America, register your startup and get rolling than in any other country, bar none. (Aside: do read DeSoto's "The Mystery of Capital" if you get a chance).
Heck, why is Vivek Wadhwa in this country? Why isn't he in India, if things are so great there? I'll tell you why: because when all is said and done, there is NO country on earth as welcoming and safe for immigrants as the USA, bar none.
I have friends who've gone back to India. Most of them went for a variety of reasons; chiefly among them being family.
And I also know some who went back because their H1B visas expired; but you know what? It is good to see that. Just like seeds from a flower spread far and wide with the wind, I hope the seeds of entrepreneurship spread far and wide; the world needs more entrepreneurs. Silicon Valley has more than enough.