What is Vanity Gallery?

Legal Definition
A vanity gallery is an art gallery that charges artists fees to exhibit their work and makes most of its money from artists rather than from sales to the public. Some vanity galleries charge a lump sum to arrange an exhibition, while others ask artists to pay regular membership fees and then promise to organise an exhibition with a certain period. There is debate as to whether galleries that ask artists to contribute to expenses, e.g. by arranging for announcements of the exhibition themselves, fall into the same category.
-- Wikipedia