Here's the thing... Money is just a points system after you get into the .1%. A billion dollars, with 5% non-compounding interest (ridiculously conservative) would yield $50 million a year. That's a metric fuckton of money, I can't imagine a luxury (not based on rarity or shaping society) that you could personally enjoy.

So I agree, we should take all their shit, except a single home and personal possessions, and give them a $50 million dollar stipend each year. Let's pin that to the minimum wage and call it absolute rich. Hell, let's let them divide it up between their children... Their family would be set for generations, and any of them could go for the prize to add another one time prize to go even higher. Let's make it fancy as hell, give them a special card or a jeweled broach they can pull out and buy anything without seeing a price... And let's make it not roll over, because we want them to be post-money

Now, the finances work out easily if we let the government invest money (crazy that we don't use that instead of taxes at this point), but the trouble is it's not about money, they need a new game to play. We want to make sure they fuck off and measure dicks with each other in a way that doesn't use our species as the playing board. They want to compete with each other for rank and social status, and we want them occupied

I don't think there's a one size fits all solution, so I'll throw out some ideas. A children's card game, next level Pokemon go battles, a monthly token that can be granted by anyone (with physical proximity) to signify they were helped by an unbillionare, unbillionare exclusive sports (I'd watch), maybe even points for how much of their stipend they don't spend in a year

We can even let them prestige, and see if with a small gift of $5 million dollars they can do it again... By that point I'm guessing their brains have probably rotted, but I'd like to give them the option

Maybe we give them nicer badges that they can whip out based on points, maybe we make a points store where they can use the emergency alert system or rent out monuments for a pizza party... Just things that money can't buy and don't meaningfully hurt the rest of us

Personally, I really love the idea of video game duels and MMA matches (either we laugh or they improve themselves to a point it's actually impressive, win-win. Let's stream it)

Let's bring back the nobility, but in a way that's fun for us and doesn't include ownership of people. Hell, let's add in titles, and let you get in through capitalism, scientific breakthroughs, or social change