2s get overlooked because they are weak and overly dependent on people. their overlly altruistic tendencies often keep them from achieving power, money or success. they're around it'sjust that no one wants to be one
From who's standpoint? Too many generalizations here, for sure.
ALL people are weak and overly-dependent on people. ALL people need other people in some capacity. At least I've never seen any who didn't. If a 2 isfj needs people to take care of, an 8 entj needs people to manage. That doesn't mean that the 2 nurse can't make the same salary as the 8 manager. They can and do.
Your assessment only works if the person assessing it believes that altruistic tendencies make for a weak person, which I don't agree with. "Power" is in the eye of the beholder, and "money" is only good for people who care to have it. As far as "success", it is understood by the person who set the goal and is trying to achieve it.
If money is a person's only drive in life (which it is NOT for at least 99% of us), then it's not that hard to get. It's the other things that make it more difficult (like personality, ego, superego).
You assume that everyone views the world as you do, and that somehow, everyone agrees on what your ideas of "success", "money", and "power" are. That couldn't be farther from the truth.
I think when viewing a 2 and an 8, and any other type, we have to keep in mind that we tend to view people in the way that they sell themselves, and not by reality. Our views are distorted by what they present to us, much as our own views of ourselves are distorted by personality and enneagram.