Zhu Huanjiang’s calligraphy works, as well as the calligraphy works of Huang Zejin, Shen Peng, and Zhang Hai, the most expensive contemporary Chinese calligraphers and calligraphers, do not have a unified price per square foot. The market sets how much per square foot. They are all unreliable, because the works of each calligrapher, calligrapher, and painter do not have a uniform size, uniform content, and uniform level of work.
No matter whose calligraphy and painting is, if you really want to know the real price or how much it is worth? Only when the work is sold can one know how much it is worth. The value will be determined by how much it can be sold on the market. What it can sell on the market is its real price. It's not you or me who say how much it's worth here, it's really how much it's worth.
No matter whose calligraphy and painting someone likes or needs, it is valuable. It’s worthless if no one likes it or needs it. The price of anything is the value generated because someone likes and needs it. Why are the calligraphy and paintings of Huang Zejin, Shen Peng, and Zhang Hai so valuable? It’s valuable because some people like it and need it.