[codingdave]

That sounds completely logical, but misses the human element.

Your story only works if the people making all the money actually spend it on helping others. Most of the time, they do not. One of the things that will trigger people to charity and generosity is going out and doing some charitable work on their own. It lets them see the results, show them the personal satisfaction that can be gained by it, and sets them up to have the desire to contribute in other ways.