I noticed that on Skeptics.SE there are quite a few questions that are in principle questions in psychology (and sometimes biology as well, so it is an issue not only for CogSci.SE, but also Biology.SE).
While the character of Skeptics.SE is a bit different than of other sites (it's aimed at specific types of questions, related to a common sense or widespread lore, not at a specific topic), I think that some questions suits more here.
And effectively, they "steal" us audience. Do you have idea what we should (or can) do? Or there is no remedy?