Incidentally, I was wondering about the traffic to this stack: I've apparently reached 222K people via my (over 400) posts on Stack Overflow, and comparatively, I've reached about 392K people via my (about 200) posts on RPG, in about a third of the time.
Now, there's a lot of confounding factors: SO gets a massively larger quantity of posts, so it's easier for individual posts to get buried. But it's pretty clear that individual posts here get a lot more attention and scrutiny than over there.