What is the value of Tian Niu's calligraphy collection in Niu Geng?

If you don't know calligraphy and painting, you'd better not touch it. You're welcome to say that 90% of contemporary paintings and calligraphy works have no collection value. Look at the calligraphy of Gan Long and Pu Jie, which is better than that of any calligrapher now 100 times. None of them are at home. Now these are praised and will definitely depreciate in the future.