There IS a point where they can get too big. I've seen a few cases myself. However, most MMOs even with a boob slider never get to that point. It's like a graphed exponential equation merged with a parabola. Boobs are bland until they get to a certain point where they rapidly become better the bigger they get. There's a sweet spot before it begins to dive again but not as extremely, where instead of sexy it begins to look obnoxious and painful. Also, LOL boob analysis.