How much is Liu Ningya's calligraphy?

The prices of the same and different calligraphy and paintings are different in different people's eyes, but no matter whose calligraphy and paintings are good or bad, there are valuable and worthless, expensive and relatively cheap. The price of a calligraphy and painting will be different in different places, different times and different auctioneers. So it is difficult to judge. What is particularly put forward here is that Runge is an unreliable reference, mainly depending on the market and my own understanding of the works.