Where's Shani? I want to see her weigh in on this.
As fun as big boobs may be, they have their downsides too. I know, hard to believe, isn't it? The things are heavy, and all that weight pulls on your chest wall, your pectoral muscles, your back muscles, your shoulder muscles, etc. They cause muscle strain and fatigue. Quite frankly, it hurts to have large breasts.
My own mother once wished she had larger breasts; she changed her mind after I went through puberty and she discovered that having big boobs (mine are 34Cs, which used to be big before plastic surgery) wasn't all it was cracked up to be. Not only is it painful, but they often bring unwanted attention. A friend's mechanical engineering professor once spent half an hour staring at my boobs from across a crowded bar. It was weird, disgusting, and made my companions and I uncomfortable; it was so obvious even my friends noticed. That is just one of many unwanted, undesirable things that have happened to me with my 34Cs...I can only imagine how much worse it gets the bigger they are.