It is difficult to make friends with people that you see infrequently or not at all. Proximity may be one reason why long-distance relationships are difficult. It's difficult to develop or sustain a relationship with someone who is a thousand miles away. Another factor in attraction is physical attractiveness. Thus, there is often a halo effect with physical attractiveness, such that people who are above average in attractiveness are thought to be above average in other aspects as well.
Physical attractiveness can be a disadvantage too, however.
For example, people who are physically attractive may think that others are doing things for them, praising them, etc. That is, they may come to doubt anything positive anyone else says to them, because they attribute that to their attractiveness, rather than to their self. The third factor in attraction is similarity. People tend to like others who are similar to themselves. People are interested in having relationships with others who are similar to themselves.