I suspect that women are pickier than men because, while a man's biological sexual goal is to distribute his plentiful sperm, the woman is the one who ends up pregnant for nine months and then does most of the caring for the resulting child. The better the man's genes are, the better the chance of survival is for the child. The more things he can provide, the more he will be able to help the woman raise the child. I think that pickiness in choosing a mate is an instinctual evolutionary adaptation.
This picky behavior among females occurs in many different species.
[youtube]http://www.youtube.com/watch?v=e8ewBWyQuTY[/youtube]
Look familiar?
And anyway, if men around you with the same level of pay are getting girlfriends, then your pay probably isn't the problem. Unfortunately, courting among humans depends largely on non-verbal communication, which people with Asperger's syndrome aren't very good at. If you look good, you're smart, and men with the same wage as you are getting girlfriends, then I suspect that the problem lies in your ability to use and interpret body language.