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I think that is obvious that almost all people isn't willing to pay a monthly fee to play a game that delivers a single player experience. People thinks that SP games should be buyed once and played at ease until be "beaten" or they get sicken of them. However, some recent developers (like Bioware) offered single player games as if they were mmos. In the last years, many "lobby games" were created too.
This wouldn't be a touble if the costs of these games and the profit expectations weren't so high, as in mmos.
How can the devs to think that a common person is willing to pay monthly fee to play a single player or to join a lobby to play "matches" with others?
I think that a game that offers single-player-like experience can only be sucessfull as P2P if the content be VERY huge and constantly renewing.