As I've always said - more than a handful is wasteful. You've got to think of the practical applications of breasts, which is nourishing babies, attracting men and sex toys.
I certainly disagree with women like Jordan, getting their boobs blown up to all sorts of weird proportions - If anything, they just seem to act as air bags, so they don't break their teeth or ruin their 3" thick make up when they fall over drunkenly in the street.