Yes, the money is doing something, but its owners are not. Sure, they have to decide how to invest it, but how difficult is that really? Markets have long trend

Yes, the money is doing something, but its owners are not. Sure, they have to decide how to invest it, but how difficult is that really? Markets have long trended upwards, so any reasonably diverse portfolio is likely to do just fine, and many of the wealthy can even afford someone to do that for them. And even if they were making decisions for themselves, the amount they earn is primarily based on the amount they have to invest, not the quality of their choices. Are the choices of someone who earns 1% on $1billion really 100x as valuable to society as someone who earns 10% on $1million?