How Many Billionaires Are There?

A recent tweet from my friend, Andrew Shaffer, got me thinking about this question. You see, if you pay attention to romance novels--pretty much at all--there's been an upswing in the number of "billionaires" in titles, series titles and books in general. He made the point that there are not that many billionaires in the world, and then questioned how many of them were young and horny. I'd also like to question how many of them are single.

Now, if you replace the B with an M, maybe we could ta...