Why do the storekeepers in Sarchi put a sticker on you when you walk in the store?

Question

We went to Sarchi, and a storekeeper greeted our bus and put stickers on us all. Why do they do that? Do they track receipts by bus?

Answer 1

they give you stickers so you can drink the free coffee in the store.

Answer 2

To give your driver a commission.

depends on the setup. they probably split it up among all of them.

Answer 3

they probably mark you as a tourist.

Answer 4

It also helps to recognize to what group you belong, and the company that brought you guys over, so that the commission can be handled properly