Maintaining a sense of danger, and getting your players to post
In tabletop RPGs, and computer game RPGs there’s always a risk of your character dying. Players will spend a long time building their character stats, collecting items so the danger of their character death makes them take great care in trying to stay alive.
In play-by-post games, players are in control of the story, and write as if writing interactive fiction. There’s no real risk of a character being killed, unless it’s something you want to happen yourself. Killing other player characters is against the rules (in every play-by-post game I’ve ever seen), so there’s not much chance it will happen.
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