i work for a company that creates customized printed POS, things to advertise for foodservice. Typically a user could choose a background, product photo, then enter their own text.
During a complete redesign of their site the client asked for a white background. After submitting the request to have the necessary graphic created i asked what the client intended to do with it. "They just want a white field with black text."
My company truly had to explain to them that it's not worth thousands in development costs to print black ink on white paper.