But if we need initiatives - not necessarily trafic-increasing ones, but community-building ones, we could certainly do something.
I find it especially nice at photography, where everybody can submit a picture and the best one is seen in the header for the next week.
We don't have to make it a competition though.
We could have a community cooking effort.
We decide on an ingredient for the week.
Everybody who wants to, cooks something with the ingredient.
And has to post how their experience went, and upload a picture.
The whole thread is made into a community wiki or some such.
Then whoever needs to know what there is to know about using the ingredient, can read the thread to 1) get ideas of different things which can be done with it, 2) read the warnings ("be careful to never overcook that one") or even see it as a challenge if he could do better (somebody writes that "I made a Guiness sauce but it turned out too bitter, I should have tried a lower temperature", and the reader thinks "I bet I can do better, let's try").
This could hook people who'd normally just peek their nose in to ask a single question and then disappear, they don't return to answer other people's questions, because they don't have the expertise or the motivation.
And they don't care about others' specific questions, because they don't have these specific problems.
"What can be cooked with X" is a matter every hobby cook should be able to relate to.
And while it shouldn't be allowed as a question because it doesn't have a best answer, a single active community wiki with a limited time for new answers won't overtake the useful questions, and will generate hits.