Dovid, given the interests of Zionist X-tians and the number of non-Orthodox Jews looking for information, I would say – almost certainly there are non-frum readers of the CR. I would also guess that there are at least some Messianic Jews and other types of missionaries who read the posts and use them for their own purposes.
That’s also another good reason for keeping the tone of our comments within the bounds of derech eretz, avoiding lashon hara, ona’as devarim, and general lack of politeness.
Two other excellent reasons. We already know that we’re always being watched by HKB”H. And what we do and say becomes a habit – today we realize when we haven’t lived up to our standards, and tomorrow the Y”H has helped it become “business as usual” and we don’t even think first.