The one secret ingredient to making a successful black-and-white portrait business is passion. Having a genuine passion for black-and-white photography and a dedication to capturing beautiful, timeless images will set your business apart from others in the industry. Additionally, focusing on the unique qualities of monochrome photography, such as its ability to convey emotion and create a sense of nostalgia, can make your business stand out. Black and white photography is considered 'classy' because it evokes a sense of elegance and timelessness. It emphasizes the subject matter, the composition, and the lighting of the photograph which is considered as a true art form.