The OP has not clarified what exactly he meant by "nice." When nature created men and women, it designated special task on both of them. Men and Women are therefore different by birth. This difference is further strengthen by our cultures making as if men are from Mars and Women are from Venus. Biologically, all women are same. However, culture plays an important role in shaping their behavior. If we analyze the biological aspects of human behavior then it is very clear why women look for men who have more resources. No matter where the women is from, she look for two things in Men; they are: 1) Commitment 2) Resources. Nature has given a special role to women: produce babies and nurture them. To meet this end, they require a strong men who is committed to her and has good resources. When women becomes pregnant, she goes through a state where she becomes immobile and dependent. Therefore, she needs someone who can look after her. She needs someone who can bring food to her when she is pregnant and almost immobile. This is a situation of life and death. It is a serious business. So, she doesn't take any chance. Therefore, nature has made women extremely picky when it comes to mate selection. Secondly, resources plays very important role in this material world. Obviously, if she has a partner full of resources and committed to her, that will be helpful to nourish her child. A healthy baby will always produce happiness in the family. In today's capitalistic societies, it is no surprise that why women look for men with abundant resources. It is a matter of life and death; it is a serious business. Once again, this material world is nothing but sex and ego. Good luck guys!