Gaston exploited the false pride and vanity of other main characters in the play "Villa for Sale".Is this a fair comment on the play?

Gaston is an interesting character. He's humorous, shrewd, financially astute, extremely impatient, and very witty. His wit and humour allow him access to the play's main characters, and his lack of values (family and honorable) are essentially responsible for his ability to exploit the characters in question. Is your assessment accurate? Yes, it is.