“If I’m understanding your point correctly, you are saying that the definition of value is subjective and dependent on the value structures of the “consumer” of the object/content.”

Yes I think that is a fair summary.

“Therefore value, doesn’t have a definition that would apply to every piece of art, or consumer of said art.”

I believe with any class of goods, whether it’s art or cars or fresh produce, etc., there are common factors that most people consider when determining its value. Is the produce moldy? Not valuable. Is the car in good mechanical condition? More valuable than a clunker. With art, factors like who made it, how old is it, is it an original or reprint, and so on, help people determine its value to them. Still subjective but not random.