The reason why this snail is more expensive than the field snail is that the number of stone snails is rare and difficult to collect.

First of all, stone snails generally grow in ravines. They are relatively small and difficult to pick. They need to be picked up with bare hands. You cannot harvest much in a day. Therefore, the cost is relatively high and the price is naturally more expensive. On the other hand, snails are relatively easy to obtain and the cost is low, so the price is relatively cheap.

Secondly, stone snails have a relatively strong reproductive capacity and are relatively abundant. However, due to the difficulty of picking, the supply is not large. Although the reproductive capacity of field snails is not as good as that of stone snails, they are easier to collect than stone snails, so the supply is relatively large. Since the supply of stone snails is small and the demand is relatively high, the price is relatively expensive.

In addition, the taste of stone snails and field snails is also different. The meat of stone snails is more delicate and tastes more delicious, so the price is relatively higher. The meat of snails is relatively thick and tastes relatively poor, so the price is relatively low.