When a Membership—a specific, special type of item in the BoosterHub platform—is sold, it creates a login to join BoosterHub and brings the person into your People database as a Member. Because of this special connection to People, it can only be sold on a Registration Page, not through the Store.

However, if you do not want the membership to create a login, then you can make it a Product in the Store and simply label it as “Membership.”