OMG! it has been discussed 1000 times! as tallg said, westerners would never come here for $2000 a month.
From me i would add. IN GENERAL, people from arab and asian countries are desperately looking for the job, and willing to grab the frist available one. Westerners are OFFERED the positions and take them only when they are sure it will be much benificial for them than what they have back home.
Also, westerners mostly work with the big and strong western and local companies, which are rich and therefore are willing to pay requested amount. Asians are mostly working with the small businesses which are hardly surviving by themselves...
So noone to blame. don't want to be underpaid, do not accept the job! simple.

*********************
“You become responsible forever for what you have tamed”. Antoine de Saint-Exupéry