Is Ou Haonian's calligraphy valuable?

Is Ou Haonian's calligraphy valuable? Very valuable. ? Ou Haonian, 1935, a native of Guangdong, now lives in Taiwan Province Province. "Lingnan Painting School". His paintings and calligraphy works were auctioned at the highest price of 30539 yuan per square foot; The lowest price is 3000 yuan/square foot. No one can think of this low price now, and there will be no more in the future. )