I don't have the source, but I recall reading that, at least at one point, Gorkhas were Nepal's #1 export. In other words, that Gorkhas ended up bringing more money into the country from outside than anything else.
Howard - your last paragraph is along the lines of my thinking. People who serve in armed forces are often in the position of serving the ends of politicians, which do not necessarily align with the soldiers' own best interests --- whether they're serving in the army of their "own" country, or that of another.