Enclose an invitation to see the band live and tell the buyer that the five dollars is for the cover charge at the club that you are inviting her to. A person will feel more obligated to go and check you out once you put the cover charge cash in their hand. Tell the talent buyer why your band is right for the room. Use a hook. Explain how your band is different, or the same, as the bands that currently play the room.
Life is sales.
From getting a date, to getting a job, it's all about how you present yourself and what you have to say. Remember, sex sells. I, in no way shape or form, am suggesting anything illegal or immoral. I just feel that you need the right tool for the right job. Personality also goes a long way.