On second thoughts, the numbers remain abstract. The B sounds great, but it doesn't work. There's no reference point. It's going to cost so much, which is the cost of a pint of milk, or a house in Knightsbridge, or an aircraft carrier - and you know how much money this is. If it's just Big, it's just Big. Nothing to be bigger than, smaller than - nothing to say: this Big.
Big numbers can work; even in astronomy, you can imagine the sun shrunk to the size of an orange, which means that the earth (a hazelnut?) is that far away. If the orange-sized sun is here, Jupiter is over there. Why don't we try for scale when we're trying to express Big financial numbers?