As someone close to someone with a lot of money, I can say it introduces a new set of worries that I hope I never have. That might also be an issue of greed though.

The problem, from my experience, is not that a person has a lot of money. It's whether a person makes that money a part of their identity. Someone who detaches their own personal value from the value of their assets is more willing to contribute the excess back to society, for example, and will be able to experience the comforts associated with wealth without the stress of spending it on those comforts.

Sadly, far too many people do associate personal value with wealth, and I feel like this has led to a lot of the inequality that exists today.