I've read some answers on a couple of questions about money and they generally assume that saying "I want more money" is something that shouldn't be said as it makes you look greedy.
Why? Money is a part of every remunerated work and, ceteris paribus, more of it is always better, so why the cynicism?
Of course, we also work for personal growth and satisfaction, but that doesn't negate the money issue.
Would the objection disappear if one said instead "Well, I want to keep learning, have more responsibility, and more money?"
EDIT:
The answers seem to be based on the people who only focus on the money, providing no further arguments to back their wanting more money. That's obviously childish.
But why does having a rewarding and satisfying job make it wrong to even ask for more money if there are arguments that back that up (market rate, more responsibility, increase of value provided due to training or insights)?
For example, what about: "I'm very happy with my job, it's very satisfying and growth enabling, but I know that my latest contributions have raised my responsibility levels, where I've succeeded, and I think I should be rewarded in kind."
EDIT 2:
Summing up, I've perceived from some answers in this site that saying "I want more money" is perceived negatively even if backed up by (relatively) sound justifications. That's another side of the question I'd like to explore. It's harder than if the person is fixated on receiving more without providing sound reasons.
EDIT 3:
Thanks a lot for the thoughtful answers. Summing up, it's a bad thing to say by itself and even accompanied by arguments, you can generally say the same thing in a better way, focusing on the value instead.