Re: still better at making it than giving it away
He (and his wife Melinda) might not be giving away the money as fast as he's earning it, but whenever I've noticed how it's being spent, they seem to be doing quite a good job.
They've spent, I think, on mosquito nets for malaria and on childhood diarrhea in Africa, both, I'd say quite effective...
And I think I noticed that Melinda was putting money / effort into the most effective way of reducing the misery of malnutrition - and that is contraception. Most governments don't seem able to cross into that particular taboo territory.
And then... if you say they aren't giving away their money effectively, perhaps you'd like to suggest some one who's achieving more through their charity.