How much is the level of calligrapher Jiang Lei's works?

There is no uniform price for the works of Jiang Lei, a calligrapher, or the works of Huang Zejin, Cui Ruzhuo, Ceng Fanzhi, Fan Ceng, He Jiaying, Shi Guoliang, Zhou Chunya, Zhang Xiaogang, Fan Yang and Tian Liming, the richest living painters in China/KLOC-0, because calligraphers and painters themselves have no uniform size, content and level.