Note that there can be other explanations than "willingness to pick up and leave your comfort zone completely". Immigrants may have a much higher "need"/want to: show their worth, climb to another social class, escape from the confines/limitations of the "ghettos" (psychological as they may be) typically associated with immigrants of same origin, etc. IOW, it just may be that the pain of working on a startup is more bearable than something else, and therefore an acceptable "escape route" ... And, FWIW, I voted "0" :)