Just hearkening back to something that was said earlier on this thread about the fact that reputation is rarely given in the quiz forums. The same thing is true of RPGs. I think the structure of the rep system is more comfortably attuned to Books where a single quality post attracts many readers and can clearly be seen and rated as "outstanding".
Occasionally in the Shire or Gondor, I may see a single post so well done in writing and characterization that I will give reputation for it. However, generally, writing well in RPGs (and perhaps performing well in the quiz forum?) isn't so much a matter of one post but quality performance over an extended period of time. Nor are grammar and style of writing (that which is clearly visible on the screen to a casual reader) the only criteria involved. Elements like cooperation between writers, dependability, and imagination are just as important. Imagination may mean coming up with an idea that is played out over a series of posts, or it may be an idea that does not even pertain to your own character but to the plot as a whole. Moreover, much of the work for RPGs, especially the more complex ones, takes place behind the scenes using extended pms for planning.
As a game founder or moderator, I also think it is important to keep an eye on improvement in people's writing. One of the greatest rewards to me is to see a poster improve: to go from halting sentences with many grammar and spelling errors to expressing themselves with grace and fluency, or to see a game proposal slowly take shape after many drafts. For all these reasons, and because things aren't tidily tied up in a single post, I find the rating system more perfectly attuned to Books than to a long term, collaborative project like a good RPG.
I've noticed this same pattern in my personal profile. Ninety percent of my posts are in RPGs, and ten percent in books (with a few extras thrown in for good measure). Yet, in terms of rep points, ninety-eight percent of those come from Books, even though I spend far more effort and brain power planning, shaping, and writing RPGs. And some of these require a fair amount of reading and digging through the back waters of Tolkien. (HoMe and the Appendices are dream resources in terms of getting the seed ideas for imaginative plots and characters!
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I've come to the point where I do give reputation at the end of a game (where I'm involved as a writer or mod) for those who have shown dedication, good characterization, and writing. I simply attach this to a discussion thread post, with a brief note explaining why I am doing this. It's not the single post that counts but the effort as a whole. And what real matters, of course, is not the rep points, but the finished product of the story and the chance to say thank you to the people who have made it happen. Most often, I will do this with a brief pm where I can really say what I want in a more detailed fashion, but rep points are also a condensed means to acknowledge someone's effort.
Just curious, but do other RPG folk have any ideas of their own on this?