Are Tu Zhiguo's calligraphy works valuable?

It's worthless Tu Zhiguo, alias, Xin Fu calligraphy, calligrapher, born in the countryside, loved calligraphy since childhood. When he was a child, he liked to write and draw with sticks. His works are worthless because of their low quality and value. But all her paintings are very popular landscapes, so they are still very good.