It's inferiority complex. Most guys who would not approach a lady because she's very beautiful have small minds. By this, I mean they evaluate themselves to be too small for these sorts of ladies.

The beautiful ladies, beautiful as they are will still get married someday. If you even look at it, most times, the guys they end up with aren't the most handsome of guys but simply those who that went forth what they want.

Also, some guys may think that going out with beautiful girls will require them to spend a lot of money , like having to buy cosmetics, take them shopping and so on. It's not always the case. Beautiful ladies are humans too and not every one of them want a guy whose a money bank.

I have seen a case like that in the past. There was this guy who could not, or rather, would not approach this lady because he thought he wasn't in her class. The lady liked him but being a lady didn't want to come out plain to show her feelings. The guy kept saying admiringly her from afar but never talked.

Then, there was this other guy which came to unto the scene. He saw thus girl and developed feelings forever her. He had the courage to share his feelings with her. The girl didn't accept at first because she wanted to give the other guy a chance to if he came around. However, the other guy never owned up and she had today give in to the second guy's pressure. She later married in him even though it was the first guy she preferred.

That's why you hear people's saying 'Go fit what you want'. Even if you get a rejection, at least you know you made a move.