I have answered this question on this thread before. First, I totally admire and respect anyone who chooses to remain CF. My BIL and SIL are one of those couples that had kids "just cause that is what you are supposed to do once you get married..."
Obviously, based on my screen name, I have 3 kids. Wouldn't change that. But the reason I read here (almost completely a lurker but have posted maybe 2 or 3 times) is because I think it is so important to always have that other perspective. My life revolves around my young children, all of my friends have young children, etc. So it is really easy to get tunnel vision and think that everyone has kids or understands what it is like to go out to a restaurant with kids (for example), or doesn't mind having kids around, etc.
So, reading a thread like this helps eliminate that tunnel vision and remind me to keep my kids in check and well behaved when in public (becuase NO, not everyone will think it is adorable!) and/or remind me when it is best to leave them at home. Not every experience should include the kids.
So, that is why I am here.
P.S. I totally agree about the tax issue. It is OUR choice to have children and that means assuming the costs that go along with that. And there is no reason for those with children to get a bigger break. It is a choice...and like any choices, there are rewards and consequences that go along with it.