Is Si Huiguo's calligraphy collectible?

Si Huiguo, born in June, 1959, from Dalian, Liaoning. He has served as chairman of China Contemporary Hard Pen Calligraphers Association, vice chairman of China Hard Pen Calligraphers Association, director of the editorial board of China Encyclopedia of Painting and Calligraphy, and president of Oriental Painting and Calligraphy Art Research Institute. His works are about 500 yuan per square foot, which is worth collecting!