What is the market price of calligraphy in Wang Qifeng?

Wang Qifeng, male, 59 years old, from Tanzhuang Town, Shangshui, is a surgeon, a famous painter and a close disciple of Mr. Liu Jiuzhou, the first eagle painter in China. I loved calligraphy since I was a child, worked tirelessly, studied famous works of various schools, explored hundreds of calligraphy skills, learned from each other's strengths, merged into a family, and became a school of my own, especially in calligraphy style.

The market price is about 5000-8000/sq. ft., depending on the works, there is room for appreciation.