You sound like one of my clueless friends that tunnel visions in on one girl with online dating, then is surprised 4 months later it didn't work out.I date medical doctors and attorneys. Different type of woman.
when I was online dating it was in Texas, which has a LARGE amount of medical personnel. It doesn't matter what profession you have, that doesn't equate to anything in the dating world for women.
I've met just as many sluttty women with high paying jobs as the ones that were just students.
You fool yourself if you think otherwise, or just haven't dated enough yet.
Your ratio from loser to winner on an online dating site is probly 100 to 1, and like I said earlier due to the Anon aspect of those dating site they will be dating more then one guy.
Women are always about who is better for me out of a group of guys, and online dating just gives them easier access to more dudes without getting caught.
Online dating will always be a cesspool.
Best thing you can do for yourself is branch out from your current circle, do charity work , or something. Not only will it make you feel better, and you will meet way more people, but your chances of meeting someone down to earth are way more likely.