If these countries have oil money in abundance then why don't they give good working conditions and pay more money. Few million dollars will hardly going to move needle for them. I smell corruption.
Racism. There's a certain pecking order in the Gulf: 1.) Locals, 2.) Other Gulf nationals, 3.) Whites (Western), 4.) Non-white professionals (Western) 5.) Other Arabs (professionals), 5.) South Asian professionals, 6.) Working class (busboys/waiters/etc.), 7.) Day laborers (mostly South Asian).
If you see a certain race/class as subhuman, why would you provide them with good working conditions?
It's certainly hard to watch this process unfold in other countries. The process is certainly faster than it was in the west but still excruciatingly slow.
http://usnews.nbcnews.com/_news/2013/04/29/17967090-students...
Even if those countries wanted to do better, these middle-men would gobble up the benefits and pass the hardwork to uneducated/naive migrant workers.
I suspect that, due to the internet, prospective migrant works are a good deal less naive than they used to be. Which makes me wonder if Nepalese will still be prepared to work there in future.