[mattalex]

To expand on that: there's also the issue that these games have to be (somewhat) competitive multiplayer games: multiplayer because otherwise there's no way to create enough content, and competitive since otherwise there's less of a reason to play the game for long periods of time.

If you've ever played a dead/dying competitive game as a newcomer you will know the problem this creates: since the people that stay around are either new or very dedicated players, the skill gap becomes gigantic, which turns of most new players.

if your game wins the Life-Service race, you draw other players in. If your game dies the very same structure that keep players around will prevent new players from joining.