Man! am I glad somebody else actually noticed this... this is one of those observations I've had at the back of my head for a long time now that I just dismissed...
I'm also 5'7" roughly... maybe an inch taller. I've had a bunch of ideas about why it's always seemed that I could draw tall girls easier.. I used to think it was simply my fault... I've typically been one of those guys who likes the smaller girls... so I always figured with taller girls I've had the nonchalant "I don't care" attitude which somehow attracted them unwittingly. In addition to some of those things posted above all of which might be true... I think that maybe as a generality taller girls in the same way as ugly or chubby girls (etc) have to compensate with slightly more outgoing personality and less strict standards. Let's be honest, in my personal experience, I've heard more guys say stuff like, "I like those nice hot thin lil chicks that are 5'5" (ie Eva Longoria) but I don't often hear guys say, "I want a behemoth 6 foot WNBA girl" As a generality, tall girls might just have a slightly tougher time... and thus open themselves to dating all kinds of guys including the more attractive albeit shorter guys... and why not?