Are Du Chongli's calligraphy and painting valuable?

Du Chongli's calligraphy and painting are very valuable. Du Chongli, male, Han nationality, born in March, 1964, from gaoqing county, Shandong province. National first-class calligrapher, member of China Hairstyle Calligraphers Association. Member of China Artists Association. Academician of China Hanlin Painting and Calligraphy Institute. Member of China People's Artists Association. Its calligraphy and painting value is between 7 million and 80 thousand.