Why is Su Daoli's calligraphy rare?

Su Daoli's calligraphy is rare because I don't often write works, so the stock is already small. As time goes by. Very few. Su Daoli, 1920, from Sujia Village, Puji Town, Zhangqiu City. Born in a scholarly family, Su Lao is a descendant of Zhou Su, a calligrapher in the Ming Dynasty. Su Lao loved calligraphy since childhood. When he went to a private school, he was both diligent and clever.