RPGs in the upper echelons of sales typically generated between five and ten thousand unit sales. Most commercially published RPGs are small press products, having less than a thousand units sold. The technology of print on demand is strongly used in RPGs, since it reduces run costs for the typical small print runs. Business models Role-playing games are produced under a variety of business models, which succeed or fail based on those models' objectives. The smallest viable businesses are one person companies that produce games using print on demand and e-book technologies. Most of these companies provide a secondary income for their owner-operators. Many of these businesses employ freelancers, but some do not; their owners complete every aspect of the product. Larger companies may have a small office staff that manages publishing, brand development and freelance work. Guided by a developer/manager, freelancers produce most of a game line's content according to a central plan. Finally, a few companies (such as Wizards of the Coast and Mongoose Publishing) maintain an in-house writing and design staff. The standard business model for successful RPGs relies on multiple sales avenues: the so-called three-tier distribution model, under which the company sells products to distributors who in turn sell the products to retailers who sell to customers. This is traditionally divided into the hobby trade (used by the majority of print publishers) and the book trade (viable for a smaller number of companies able to absorb returns and provide sufficiently large print runs). The industry consensus is that hobby retail sales have greatly declined, with the balance of hobby games sales moving from RPGs to miniatures games and collectible card games direct sales via the internet, through an online retailer or through the company's own electric storefront. electronic sales and distribution, either without any physical product at all (e-books) or through a POD service. Once limited to small companies, this sales venue is now employed by publishers of all sizes. attendance at conventions and events; this is particularly common among live-action games. Typically, RPG publishers have a very long life cycle once they manage to generate an initial successful game. TSR, the initial publisher of Dungeons & Dragons was an independent entity until 1997 when it was acquired by Wizards of the Coast, who was subsequently acquired by Hasbro in 1999. Many of TSR's contemporaries remain in business as independent publishers. The core design group of