Attractiveness is more than how your character looks. It embodies your character's style and class, the way your character makes friends with the NPC's in the city, and that sort of thing.
A) Followers
Followers are those who will support a character by voting, fighting, and basically hanging around and helping the character in everything that the character does. For every Attractiveness point at or above 75, your character will have 1 * (Experience Level) peasant followers. The followers will fight for the character while in the city. If the character wishes the followers to accompany the character on a quest situation, the character must make provisions for the feeding and transporting of all the followers.
B) High ATR will also get better prices. The formula is as follows: Starting at a 10% discount for attractiveness equaling 75, add 2% discount for every point above 75.
C) Your starting gold for purchasing equipment in your character sheet is 50 time your ATR