What is the collection value of Ling Zhiming's calligraphy works?

No matter whose paintings and calligraphy are good or bad, there are valuable and worthless, expensive and relatively cheap, so generally we can't talk about it in square feet, we can only say how much it costs per square foot. Long Ge has no clear purpose, but only a reference, mainly depending on his own judgment and understanding of his paintings and calligraphy, as well as the hype in the market at that time. So it depends on his handwriting. If he is a celebrity. My own opinion, please forgive my mistake!