Is Zhang Dongyong's calligraphy valuable?

His calligraphy is very valuable and has a certain collection value.

Zhang Dongyong, whose pen name is Yi Rui, is good at pasting books, inscribed plaques, inscriptions and couplets. Born in 1964, his ancestral home is Tongwei, Gansu, and he now lives in Beijing. Member of China Calligraphers Association, President of China Classics Society, Vice President of China Traditional Chinese Painting Institute.

Write the Buddhist, Taoist, Confucian and traditional classics in print with an ingenious spirit.