In most games, the players are the buyers, but in these sandbox games, the roles are switched.
People think of open-world exploring when they think of sandbox games. The point is to wander around and try new things. Different quests, dungeons, and obstacles are what make the game fun. Specialty shops are there to help players get ready for these tests. Here, the heroes can buy tools and other things that will help them. But some playground games also throw a curve ball in this area.
In some games in this type, you can open your own store. Different things happen at each of these places. Depending on the type of game, the way they work can be very different. Still, they all help players put down roots, which makes them feel more linked to the world.