H-1B is intended to be temporary, 3-6 years. That means no need for pensions and no time to accumulate a great deal of raises or benefits.
I would also imagine it's a lot easier to convince an employee to "go the extra mile" when you're dangling their ability to remain in the country over their head, especially if they're also applying for citizenship.
I would also imagine it's a lot easier to convince an employee to "go the extra mile" when you're dangling their ability to remain in the country over their head, especially if they're also applying for citizenship.