Are Xie's calligraphy works collectible?

Xie was born in Guangzhou on July 1962. /kloc-0 joined Guangzhou Bus Factory in June, 1998, 1980,1August, 1998 as a driver in a bus company. He had a hobby of painting and calligraphy since childhood, never worshiped famous teachers, taught himself and practiced his own style. He is good at cursive script and official script, and has no collection value.