With this message board, additional responses remain with the original message and earlier responses rather than causing the thread to be bumped to the top of the list. You're right, people are unlikely to search for new responses to old messages far down the page. I occasionally look for those kinds of new responses but generally not beyond the current page. So, it would be better to start a new message and copy or summarize or reference the original message if you want your response to be noticed. Sorry, that's just how it is.
Ron Carlson, Webmaster