It used to be that users had to purchase access to the marketplace with points earned by posting. However, the system now automatically gives users access, so there's no need for that type of reward store.
We used to have a store, but then we took it down, it wasn't popular. What you are referring to is, unfortunately, the result of a bad uninstall process of the hack. Some parts of it are left in the system, but it does not intervene into our current marketplace regulations or how it functions.