Evantime34 is right. The type of girls who typically gravitate towards online dating are ones who are sick of the bar/club scene and the typical "god's gift to women" dee-bags that approach them in those den's of debauchery. The appeal of online dating is that you can look for people who share common interests, goals, beliefs as opposed to just going into a standard meat market.
That's not to say that there aren't plenty of loose trollops out there waiting for you to slick back your hair, puff out your chest, and drunkenly grind up behind them while the latest Miley banger blares in the background. Those strumpets are out there too and certain guys can have a ton of success with them with just the right mix of attractiveness and confidence.
I'm too ugly to rely on pure confidence. Troll-faced imps like myself require personality to nab the ladies. Online dating is right in our wheelhouse.