Are Tang Siling's calligraphy works valuable?

Tang Siling's calligraphy works are very valuable. According to relevant data, the average price of Tang Siling's calligraphy works is 12000 yuan, and Tang Siling was born in 1954. He is a famous calligrapher in China, director of the Chinese People's Association for Friendship with Foreign Countries, director of the China-Friendship Association, member of the China Calligraphers Association, director of the China Painters Association and member of the Chinese Calligraphy and Painting Collectors Association.