Is Xu Qingjiang's calligraphy collectible?

Xu Qingjiang, whose real name is Silent, was born in Wudi, Shandong Province in March, 1956. He is a pen and ink family. His works have been presented to Russian President Vladimir Putin and Thai Prime Minister Yingluck. His works have been collected by foreign friends such as the United States, Japan, South Korea, Singapore and Thailand. Its 5000-meter-long scroll of calligraphy and painting is the Guinness World Record holder. His works are collectible!