How many times have we heard about the ultra-rich wanting to "give back", saying that they just have too much money and that they feel the need to get rid of it.
That's of course a lie. It's just a way to avoid paying taxes, allocating that wealth instead towards charitable organizations that in exchange will accept to sustain whatever cause the donor wants to push for. It does make sense not to want to give your money to the government, but it is unfair that ultra-rich are able to do this while the rest of the population can't. Of course everyone can donate, but that doesn't buy them power and influence.
The point though it's that there's no such thing as feeling like you have too much wealth and that you have to give it away. It takes a lot of effort to reach a certain amount of wealth. One needs to own 10 millions before owning 100, and then needs to own 100 and 500 before owning 1 billion.
There's plenty of time and plenty of chances to stop becoming that rich in the course of the many years that it takes. It also takes a special drive to want to accrue that much wealth and the power that comes with it.
The general population can't normally wrap their heads around the idea of wanting more wealth and power for its own sake (or more likely, as a competition). When you live dreaming of owning a couple of houses and a couple of sports cars, you may think that anything beyond that is just gravy.
That's now how it works. To become extremely wealthy it takes a special kind of drive, the kind of drive that doesn't just dissipate. In fact, with time one may feel inclined to think that he's some kind of god figure, and may start to feel entitled to mold the world to his own image. This works for politicians as well, although those tend to settle for perhaps less actual power, but more visibility.