Is Zhang Guangwu's calligraphy collectible? Is he a calligrapher?

A good calligrapher is a calligrapher, whether he joins the calligraphers association or not; Especially in China, some folk calligraphers are very powerful, which is one of the wonderful greatness of China's calligraphy, endless! In addition, no matter whose paintings and calligraphy are good or bad, there are valuable and worthless, expensive and relatively cheap. The price of a painting and calligraphy will be different in different places, different times and different auctioneers, and it is not an absolute price; Besides, any personal evaluation is only one-sided and personal. Close-ups, celebrities and people who especially like them may make the price higher. As long as there is no problem, it is collectible. My own opinion, please forgive my mistake!