is that they can work cheaper than you or I could. That fact, and that fact alone makes them more valuable to US Companies than any Native Born US Citizen ever could become.

So much so that they overlook the language barrier, the low quality of work, the miscommunications, the low morale and productivity, the malware in code, the rudeness to customers on a help desk, and any other factors that crop up from them. If any native born US citizen did any of those things, they would be fired quicker than you could say "Synergy" or some other management buzzword.