1 - The Billionaire was a Genuinely intelligent and an expert in the field that made their net worth, unfortunately they have stopped working in that field to the best of my knowledge. And of course, the more they have remained a billionaire, the more they have become isolated and disconnected from reality. The Billionaire was a weird dichotomy of wearing casual clothing and acting down to earth but having the underlying arrogance and personality radiating in their behavior. It was kind of weird.

2 - They dont respect what you have to say. Basically, the less "trusted" you are in the staff and certainly in the general public, the more you are to be disregarded, ignored, blocked etc.

3 - I wasnt paid. It was Social-Charity work. Although the money I paid for certain things, I was never even reimbursed.

4 - No

5, 6, 7, - No, in general Voldemort was nice to the staff of his compounds, especially security, etc. I think Voldemort knew that the livelihood depended on them so it wasn't likely that they would do anything to piss them off. Other than the Isolated view of wealth and Out of touch view of reality, Voldemort was a pretty average person behavior wise. I Certainly didn't see any degrading or hedonistic behavior.

8 - Eh, Probably not. I can imagine it would take a few years to get a hang of it again.