Too many Margherita's ?

Yesterday, I glanced down at the little headlines on Yahoo and it said:
Buffet to give away three quarters of his fortune.
And I was like, "That's cool, but I still hate his music and those parrot-head fans of his." I had read somewhere a year or a two ago that he was one of the highest grossing touring acts of that year. "Cripes, did he make that much money off of a few hits?"

Then I was listening to BBC News and they said it was, Warren Buffet. "Ah, that makes more sense now Mickey, doesn't it?" The story went on to say that this humongous amount was going to the Bill and Melinda Gates Foundation. And Bill and Melinda have all this money and Bill and Melinda have given away billions...But wait? Shouldn't it just be like, Bill's gazillions? I mean, what did Melinda come into the marriage with. Was her dowry that high? Does Bill just cringe when he hears this 'Bill and Melinda's money'? Is he driving in his Prius and listening to NPR and mumbling to himself, "Yeah right, Bill and Melinda's fortune...sheesh."
Like, did she say,
"Um, Bill, maybe now that were kind of living together, maybe we should get a joint bank account? Let me just make my next payment on my Discover card, and we'll just combine em', kay?"