“However, maybe a small minority happy to do it would gradually build momentum over time.”
This seems possible, but if the goal is to maximise resources, I would be quite surprised if e.g. the number of billionaires willing to give away 99.99%+ of their wealth was even 1/10th as high as the number willing to give away 90%. Clearly nobody truly needs $100m+, but nonetheless I would be very wary of potentially putting off a Bill Gates (who lives in a $150m house ) due to being too demanding, when 99% of his wealth does approximately 99% as much good as all of it would (maybe even more, as he serves as an example to other billionaires which they might be more likely to follow than if he gave it all away).
“However, maybe a small minority happy to do it would gradually build momentum over time.” This seems possible, but if the goal is to maximise resources, I would be quite surprised if e.g. the number of billionaires willing to give away 99.99%+ of their wealth was even 1/10th as high as the number willing to give away 90%. Clearly nobody truly needs $100m+, but nonetheless I would be very wary of potentially putting off a Bill Gates (who lives in a $150m house ) due to being too demanding, when 99% of his wealth does approximately 99% as much good as all of it would (maybe even more, as he serves as an example to other billionaires which they might be more likely to follow than if he gave it all away).