How come it's still cheap for Tmall supermarket to shoot on behalf of it?

The price is similar to that of ordinary supermarkets. But it has the following three advantages: 1) more than 88 packages. 2) Recently, I often get 88- 10 coupons (or 100- 10 coupons). This is equivalent to a ten percent discount on the total price. There are many ways to get it. Just look at Baidu. There are two ways: first, find the coupons of the ceramic cat supermarket. Now you can get100-10; Second, spend 0. 10 yuan to buy 88- 10 coupons on Taobao (1 ID can only buy 1 time). 3) Every morning and afternoon, there are two kinds of 1 yuan spike products. The original price is generally around 10 yuan, and it is earned every second.