there is probably a high correlation probably between smart girls and being more ugly (do not confuse with ugly girls all being smart) but there are smart girls who are pretty and there are plenty of dumb girls who are ugly.
my girlfriend is hot as f*** and she had a 4.3 gpa in high school. she is graduating with honors from a big university in like a week. but I know what you mean tho. its like they have nothing else going on besides school and they know it. so I'd say not always this is true.
I dunno, I spent many hours in the library in college and I saw some very beautiful girls there.
But I do agree that ugly girls are sometimes pushed by their parents to pursue activities that might help them provide for themselves in the future. Pretty girls, on the other hand, would probably be able to find a man who could provide for them. That was definitely the case in my family.
When you are in high school being beautiful is valuable. When you get out in the real world, being smart is valuable.
Any ugly girl that is intelligent and hard working can get a good guy to marry her if she takes care of her health and does what is in her power to maintain a professional and acceptable image.
Many men appreciate the effort woman put into making themselves beautiful more than the actual product of beauty and attractiveness.
Men are also more likely to cheat on you when they love you for something other than your brains or personality. I know so many attractive guys who can have their pick of the ladies, and they all choose the ones that are intelligent and hard working.
Also the smarter the guy, the more likely he is to choose intelligence over beauty. My dad's good friend makes 2 000 000 dollars a year, and he chose a very fat girl who was just as a smart as him.