>>3. PhD programs are often used an immigration tool rather than as preparation for academia. Many PhD students I worked with were getting PhDs so that they could emigrate from India/Pakistan/China to the US and get a well-paying job. I'm sure a similar phenomenon occurs in the UK.
I don't think this is true at all. Why do PhD (4-6yrs+), when a MS is enough to find a job and get an H1-B/GC ??