1. Small pork intestines have less fat than large intestines, and usually do not have a lot of fat attached to them during the cooking process, so the price is relatively low.

2. Pork small intestines have less meat in it as compared to large intestines, hence the price is relatively lower.

3. The caliber of small pork sausage is smaller than that of large sausage, so it is more time-consuming and laborious to make, which also affects the price.

Overall, both small and large pig intestines are edible, but large pig intestines are more advantageous in terms of taste and price.