The amount of ignorance displayed here is appalling. I'll just
reiterate what others have stated above.
First off, it would be completely illogical for them to start an
uprising; their immediate families live here with them, not to
mention their extended families at home in Nepal awaiting their
return.
Secondly, being a mercenary is in many ways better than being a
conscript. The difference is in the choice, or lack thereof. If you
chose to do something you'd obviously put more effort into it.
As much as I like to believe and live by ideals, let's be
realistic here - money is a damned good way of ensuring people
behave.