Steam has added subscription plans for games as a feature and the first one to utilize it is the MMORPG Darkfall Unholy Wars. The game costs $40 and will then auto renew $15 each month. Steam users get detailed email on each renewal and are free to cancel at any time. A FAQ is available for anyone interested.
New Service Gives Gamers Flexibility and Control of Subscription-Based Games
April 25, 2013 — Valve, creators of best-selling game franchises (such as Dota 2 and Half-Life) and leading technologies (such as Steam and Source,) today announced the addition of Subscription Plans to its offering of services.
With Subscription Plans, Steam offers gamers the ability to sign up and manage payments for subscription-based games on Steam. The launch title for the new service is Darkfall Unholy Wars, with additional subscription-based games to follow.
Steam customers may now sign-up for, manage, cancel or renew game Subscription Plans at any time, online directly through Steam.
Visit Steam Support for more information about Steam Subscription Plans.
Article from Gamersyndrome.com