[member="Kei Amadis"]
In addition: I hardly believe it would be counted that bad, just like how they don't penalize on the quality rule if it picks up. It's when it gets reported and turns out to be excessive that this rule would be effective.
Edit: Just got your question!
Because, there's lots of temptation to get your dominions done. I won't like and say I didn't ask for outside help just so we could get things done faster but luckily for me we never exceeded our faction's writer count in doing so! Not that it was my intention, but it was that very reason I began nagging myself. I did a survey to see how people felt on the quality of writing but because we were so conscious about getting it over with that the writing became rather stale. Less work was actually put in. The stories did get better, and neither of them were low quality, but it could've been better.
Rules like these and the 1/5 and the quality assurance rules are all helping reshape the culture of dominions into being more of a group activity rather than a race. This one is adding to that by assuring that the group activity is still a faction effort. I've expressed this before and will again; dominions are for factions -- it's their reward, so why shouldn't it be their effort too? If people want to get activity they'll just have to sit down longer and actually discuss an interesting storyline before posting their dominion. That way people will be interested in posting not so they can help their buddies complete the thread but so they can take part in something that's legitimately as fun as a fleshed out public -or- private thread.
TL;DR
The number of posts required becomes a driving force to reach post 100 , not to create a fun thread. Because regular threads don't offer a boon after X posts.