According to this: $63M to develop the original release or World of Warcraft, plus at least $200M more for all the subsequent releases. https://mmos.com/editor

According to this: $63M to develop the original release or World of Warcraft, plus at least $200M more for all the subsequent releases. https://mmos.com/editorials/most-expensive-mmorpgs-ever-developed https://mmos.com/editorials/most-expensive-mmorpgs-ever-deve... Total costs of $200M as of 2008: https://www.wired.com/2008/09/total-operating/ https://www.wired.com/2008/09/total-operating/