[tsycho]

+1 to what you said. In addition, green cards take 6-12 years to process for those born in India or China (6+ years for EB-2, 10+ years for EB-3), so even if people want to get them, the wait duration is insanely long. And while your green card is being processed, you have significant restrictions in changing your company, job title or location, else you might be put back to the beginning of the queue.