Women getting a good salary is a form of independence that many men, myself included, actually find attractive. But I have no ego to speak of, lol.
I don't really get that ego either, as in, if you are in love with someone, you want to support them (notice I did not say "be able to support them") - which includes supporting the career choices she wants to make. If those include her earning more than you - all the better as a couple, right?
I really don't get the big deal about this, to many men that have no control over societies imposed "men must be providers". Yes, men must be providers, luckily you can provide a lot to a relationship that has nothing to do with money.