What do you think of the idea that these rich people are not susceptible to bribes of special interests? They could pursue their own agendas, but at least it's easier to identify. If they enact a policy that helps their companies at the expense of competitors then they open themselves up to criminal prosecution. The Democrats have proven all too willing to pursue this in the extreme, to put it mildly.
There's always the chance that there are other wealthy people like Trump who want to make a positive difference in the world now that they have already made it for themselves. Being wealthy has its own slate of temptations. Unfortunately, I can only guess about the appeal of megalomania.
I would be surprised - but let's be open and say by their deeds shall we know them!