Is Fei Zuning's calligraphy collectible?

Fei Zuning's calligraphy is very collectible. Regarding the price of Fei Zuning's calligraphy works, according to his personality, learning experience, inheriting tradition, the quality and technical content of his calligraphy works, referring to online sales records, and the title of member of China Calligraphy Association, I think the valuation of Fei Zuning's calligraphy works should be 2,000 yuan per square foot 1500 yuan.