"We're humans and humans are not driven by logic" - Well, that depends on perspective I guess too. Even mistakes could be a result of some concept of logic; not enough experience to not make that mistake, etc...
needs are a form of logic to me, but here i'm thinking this way because of my programming background. If we need to do something, it's logic that convinces us to do it or that we require it.
Keeping in mind, that needs do
change over time for humans (like any other living thing that needs to adapt to it's environment and surroundings)... Evolution, and not just in it's physical form by definition. So here: "Needs that were installed into us, aeons before anyone even thought about, that one day, there would be a thing called money." - This implies that we're talking past tense, in which money was not a requirement because it was not needed back then. Now/Today, it's a social status that represents 'power' to some people, and behind that ideology, I believe it's mostly greed. People that are poor would like more of it to 'just get by' but people that have the amount in which some people can only dream of, also would like more. (I haven't heard anyone desiring to have less money, it's always been a quantity of 'more', unless that person has enough to live comfortably, but my point against this is: If we gave those people more money, would they deny to claim it? If they did, it's probably dealing with some psychological phenomena, to which i'd have less knowledge about (depression about somehing, etc...))
However, I guess it could be BOTH fear and greed. Because depending on which side you're on.... Have's or Have Not's... If you've got enough money that you don't have the fear of going bankrupt, then you may be driven by greed to have more power; money. Otherwise if you're on the poor side, you may just be wanting enough money to get by, which would be motivation by fear; becoming homeless.
It's beomce quite a debate lol. But i'm willing to settle with what I've posted in this thread here. Motivation is based on perception, thus it's unique from person to person.
I do not disagree with you though, I can see your points and I never would've thought about it that way, being a taxpayer myself lol. Although I now think it's lots more complex than words can describe, being a result of a multitude of things in a complicated formula probably not worth trying to solve... Therefore, as I originally thought, "greed" could be part of it, but not the only aspect of it.