I think being attractive and knowing how to use that to your advantage can give very significant benefits in life.
The knowing how to use it part, or having a good personality is essential though. I can't imagine even the most beautiful of people going very far if they have a severe lack of intelligence and are miserable and rude.
I think I have had benefits in the past that are partly down to how I look, which isn't anything special but not bad either, and partly down to knowing how to talk/ask in the right way. I don't think either one would have worked without the other.
I know one stunningly beautiful girl, she is a friends sil so Ive met her a few times but don't know her well, and when I first met her I was amazed that anyone could be that perfect looking. But, I have heard her make quite a few bitchy comments, and I've heard how horrible she has been to my friend, and I honestly can't see her physical beauty any more. She just doesn't look as pretty as she did when I knew nothing of her, even though she still looks the same. It's wierd and hard to explain.
Likewise, I have known people that are just average looking to become very attractive when I have got to know what lovely personalities they have.