What I have seen is that ladies who were doing well, who had potential and saved their money and had good quality breast augmentation come back and earn even more money

For gods  sakes make them in proportion to your body.  A tiny girl with DDD's looks and feels stupid. Barbie doesn't do it for me

Just like your business investments, there is a psychological component (ego), as well.  You might decide to increase your office space: should you spend the investment $ on the top floor of the fanciest skyscraper with mahogany fixtures or will cheaper space with plywood and formica in a suburb suffice?  

In your, my or many others' opinions, some girls don't need augmentation but in their own head, they do and THAT seals the deal no matter what others think.  If she feels better, is more confident, etc and performs better, that secondary effect could also increase business outcomes.  

Maybe the Freakonomics guys should do an analysis of this?   Or maybe they already have

Any lady considering getting breast enhancements needs to consider the fact that some guys prefer small natural breasts. By getting enhancements, these potential customers will be lost.  Perhaps many more will make up for it, but it's a trade off.  Bigger is not always better, at least to some guys way of thinking.

I had beautiful natural full C's and decided to upgrade. I chose the best doctor, the best quality implants and voila they are super soft to the touch and no scar to be seen. I can't say if business got any better simply because some prefer natural and some like big breasts. I know that I did not lose any of my regulars and I have never had any complains from new friends.  I do miss my old pair sometimes as clothing became an issue. A tiny waist and a large chest make it difficult to fit into most size 6's unless we are talking about spandex. However, I can tell you that when  I'm alone, I'm always massaging and living on them. At the end of the day that's all that matters.  
Tata

Kisses

Elle vegas

I've considered an areola reduction, though.