Based on your answer, does that mean a woman in a high paying field (doctor, dentist, lawyer) will value confidence less than a woman in a low paying field (hairdresser, nurse)?
You're missing the point. Having "confidence" isn't about who makes more money - heck, I was dating women who were lawyers, doctors, etc. when I was working at a Quiznos shop and living on someone's couch.
According to the dictionary, confidence is "belief in oneself and one's powers or abilities." Meaning, if you either have or can project the believe that you believe you have the ability to protect a woman from harm, give her a good time sexually and show her the kind of life no other man can show her, you can maintain (and increase) a woman's desire for you, regardless of your life situation.
And, whether she's a woman that makes a lot of money or doesn't, they all have that need to be with a man that is sure of himself and what he wants in life. Women themselves are always questioning themselves - even if she has a high-paying job, she may think she's not pretty enough, or weighs too much, or isn't sure of the next move she needs to make in life. In short, when she has these questions she needs someone to either guide her or help her realize what decision would be best for her to make. Men are GREAT at decision making - or at least they are supposed to be - and, therefore, it does her no good to find a man who can't help make a decision when SHE can't make a decision either.
That's why women HATE when they ask a man what he wants to do on a date, and his response is "I dunno - whatever you want to do." YOU are supposed to have enough confidence in your decision-making abilities to choose something and KNOW she'll have a good time (by virtue of simply being with you, and not having to make the decision herself).