Every online game I've ever heard of is pay to play, although $30 a month is steep (about twice what they usually are). Anyway, the only "online" games I know of that are free are Warcraft 2, Warcraft 3, Starcraft, Diablo, and Diablo II. And even then, they're not really online games, rather just games with online capability. You get the same experience online or offline, there are just other people there (sometimes) on the online games.