Is it valuable for black glazed dogs to lick bowls in Yuan Dynasty?

According to Baidu Encyclopedia, the market price of black glaze licking dog bowls in Yuan Dynasty is about 20,000 to 60,000 yuan, and the collection value of licking dog bowls is very high.

Dog licking the bowl is a unique decorative technique of northern black glazed porcelain in Song and Jin Dynasties, that is, adding iron to the glaze, and after high temperature firing, the iron is oxidized to a gorgeous reddish brown.