Are Yao Yanan's calligraphers' works collectible?

Calligraphers in Yao Yanan are very collectible. Yao Yan 'an is a young calligrapher, a member of China Calligraphers Association, a member of National Young Calligraphers Association, a member of China Bangshu Calligraphers Association, an image calligrapher, a member of Gansu Young Calligraphers Association, a first-class calligrapher and an academician of Beijing Contemporary Painting and Calligraphy Institute. His works have been exhibited and won prizes in many national calligraphy competitions, and some of them have been collected by friends, collectors, painting and calligraphy institutes and other institutions at home and abroad.