Surely we just read posts, tut or nod sagely and move on, after throwing in our own twopennorth occasionally if the spirit moves us. We've really no way at all of knowing how many people have actually read our posts, so how would you even know if you were being ignored? Unless I'd asked a particular question, I wouldn't expect a reply, and if I'm on the Politics thread, I usually heave a sigh of relief if I manage to make a point and escape without a mauling.
If you start a new thread and nobody posts, it could just be that you've started it at a quiet time of day. I only tend to look at threads that have been posted on in the last hour, so probably miss a lot.
mollie, you can only post at the end of the thread. What folk are saying is that sometimes the end of the thread turns out to be the last post on the visible page, so that the comment after yours appears at the top of the next page and yours can be overlooked. Sorry, I know that explanation is as clear as mud, but I hope you get the gist!