Now, the Jєωs in general don't believe in an after life (though some do), so the advancement of their own nation at the expense of all else does make sense from that key premise.
Indeed the
frum Yidden are largely atheistic/materialistic, but those at the top are not atheists, certainly do believe in an afterlife—even believe in reincarnation,
gilgul.
One of the more recent and more asinine examples of that belief is the
beit din sentence on the reincarnated lawyer/dog (see below).
REINCARNATION (excerpt from Judaism 101 in the Library section)
Search “gilgul.”
"The sages of the true wisdom teach that every Jєωιѕн soul must REINCARNATE many times until it has fulfilled all the 613 mitzvos in action, speech, and thought." Shulchan Aruch HaRav: Hilchos тαℓмυd Torah 1:4
Rabbi Ovadia Yosef on the REINCARNATION of Judaic souls as "h0Ɩ0cαųst victims":
http://www.independent.co.uk/news/world/middle-east/rabbi-says-h0Ɩ0cαųst-victims-were-reincarnations-of-sinners-711547.html
"If a Noahite is striving in the learning of Torah... reveals new aspects of Torah, he may be physically restrained and informed that he is liable for capital punishment... If the court that is established in consonance with the Seven Universal Laws gives the death penalty to a Noahite, the execution is an atonement for the person's past transgression... Furthermore, the Noahite must experience REINCARNATION to be able to atone for transgressions he has done." Chaim Clorfene & Yakov Rogalsky, "The Path of the Righteous Gentile: An Introduction to the Seven Laws of the children of Noah," (Feldheim Publishers, 1987) p. 42 (The book bears an official letter of approval of its contents by Rabbi Mendel Feldman, Shearith Israel Congregation.)
Cranky lawyer reincarnated as dog, sentenced to stoning, escapes:
http://www.sott.net/articles/show/230041-Jєωιѕн-court-sentences-dog-to-death-by-stoning
Do they work for it in cognizance of their service to Satan or are they simply greedy ?
Yes and yes, the greed is expected with their service to Satan.
I always give pause to the thought that "Satan loves to trick his own."