The question is a little bit misleading.
Maybe (since I'm italian as you can easily guess
) I would participate to an italian forum but as a general rule I would be against it.
My english is far (very far, indeed) from perfect but i prefer to know that the useful information is kept as "accessible" as possible. I am strongly convinced that is far more important being able to read than to write and a religious monolingual approach is the way to go.
For instance I was a little bit disappointed with the german forum when I was about to buy a pocketbook since I can't read german at all and that forum was an information mine. Yeah sure, you can always use an online translator, but that's just one more hassle.