Can you sell big data?

Excuse me, I couldn't help but notice your mention of big data. Could you elaborate on whether it's actually possible to sell big data? I'm curious about the legality and ethical implications of such a transaction. Additionally, if it is indeed feasible, what kind of information would typically be included in big data sets, and how are they typically valued? Is there a thriving market for big data, and if so, what are the primary buyers and sellers? I'd appreciate your insights on this matter.