I'm not absolutely sure that ANYTHING is a very good thing in the end, if taken to extremes.
amassing any kind of fortune is most likely based on theft and extortion so it would even out it a bit for the state to take it in possession as taxes.
It would benefit the kids too, in the end, as they'd not grow up to be slothy worhless billionares but be encouraged to get real jobs and contribute to the society.