Answering, "anyone who pays us money," is a cop out.
Almost as bad is describing your customers by demographics. It's only a little interesting to know that they are, on average, 32 year old, white, male, lacrosse fans.
No, what we need to know is:
What do they believe?
Who do they trust?
What are they afraid of and who do they love?
What are they seeking?
Who are their friends?
What do they talk about?