ANSWER: The major marketable characteristics of snail is it's nutritional value to our body. And the lesson we learn from them, when we feel depressed and anxious.
EXPLANATION: The snail is a very nutritious meat that contains protein, fat and oil, minerals, and vitamins. It protein content is more higher than that of birds egg. The slime from snail helps to treat dehydration, dry skin, stretch marks, damage tissues in the body, and many more. The snail has much value in markets, as it has become a boast to our daily nutritional content.
Some people buy snail, to help them meditate daily or during depression. This helps them to calm down their emotions as they watch the snail, because snail teaches a lesson of patience (in it's movement) and articulation ( in the fast way it responds by retreating into it's shell, when it sense strange signal).