Pigskin is expensive, and only pigs with no problem dare to sell it with skin. Experienced pigs can see from the skin the information of old pigs, tender pigs, sick pigs, what parts of pigs are, whether they are fresh or not, and the amino acid content of pig skin is much higher than that of pork.
It must be expensive with skin. After all, it already has a layer of skin, so don't peel it specially. Besides, pigskin is nutritious.