What keeps you posting in an RP?

A question for everyone. Note that this doesn't mean what draws you into the RP in the first place, although your answers may be the same for both questions.

I want to know what keeps you writing those posts day after day, week after week. Is it an attentive and persistent GM? Is it a constantly evolving story? Is it a list of rules that seems to make continued posting easier (maybe the required post length is short)? Is it character interactions that you can't seem to tear yourself away from?

It can be as something small and specific as "All the characters had nicknames in this RP, and I love nicknames, so I kept posting" or something bigger like "The storyline really grabbed me here." I want to hear whatever reasons you can think of.

So, what keeps you posting in an RP?

Source: http://feedproxy.google.com/~r/RolePlayGateway/~3/-NxEpuPQFMI/viewtopic.php

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