Is Zhan Yajun's calligraphy valuable?

Worth some money. Zhan Yajun is a famous calligrapher in China. His works enjoy a high reputation in the calligraphy field and are expensive. The artistic value of calligraphy works largely depends on the artist's reputation, the quality of works and the market demand. Therefore, it is a subjective question to evaluate whether a calligrapher's works are valuable.