Why are Sun Xiaoyun calligraphy and painting sold in the market so cheap?

Why are Sun Xiaoyun's calligraphy and painting so cheap? Their works are good at cursive script, and many of them have unique aesthetic standards of calligraphy, classical style and leisurely rhyme. At the same time, this creative realm of pen and ink also perfectly embodies the gentleman's style. Calligraphy is unique, so is Sun Xiaoyun's calligraphy art. He is full of pen power and is a phoenix. When he first wrote Huang Ting, he was worthy of everyone!