Malayalees aka mallus, Tamilians aka madrasis joins any company with enough qualification. Ofcourse they will leave for greener pastures when they get more experience. Maharashtrians are very close knit. They need their relatives /friends or associates around them.Unless a dire need arises, they will not leave their place That is the reason when asurvey was conducted in Muscat, there were very few Maharashtrians compared to Mallus or Madrasis. So if the exchange takes place, the Industrial hub of Maharashtra is going to suffer.