You don't have a problem when the covetous greedily demand that someone else's "excessive wealth" be forcibly taken so that they can benefit from what they have not earned?
Let's begin with this question: How do you suppose one goes about "earning" fifty billion dollars?
Please answer that and we'll take it from there.
The exact same way someone "earns" any money. Someone "rents" out his/her labor, knowledge, skills, and/or capital, and that someone expects a reasonable "fee" for doing so. Some are stronger, smarter, more skilled, and/or have more capital to rent out, and they receive larger returns.
The question should be: Why does that bother you so much?
Is there a shortage of money that prevents you from receiving just compensation for your labor, knowledge, skills, and/or capital? Or, most likely, you are just envious of those rich bastards, with their fancy cars, and big houses.