How much is the calligraphy of calligrapher Wang Haiying worth?

The price of a painting and calligraphy will be different in different places, different times and different auctioneers. For example, some paintings and calligraphy by the same person are worth 1000 yuan/square foot, some are 2000 yuan/square foot, some may be 3000 yuan/square foot, ... even 1 000 yuan, tens of thousands/square foot ...; Moreover, changing to another auctioneer or intermediary is another situation, which is not easy to judge and is not an absolute price.