It's sometimes hurting when you quote or mention someone with the mind to further engage in conversation with the person, but the fellow might never return again to the thread. Could it be these set of users that Royse777 and Hhampuz complain that they use the forum in a wrong way or they post for weekly pay.
I didn't use any notifier for years and netheless I looked through the topics I posted anything for at least several days in case someone will answer me. If I didn't answer then it was only when I thought that my answer will be unnecessary. So if it was not @me in the topic I didn't write anything in I saw that someone answered me.
As for those who don't answer. I see many who never answers. It is not a mean of not knowing about that they have an answer, they just don't want. They write some exact number of posts for a signature campaign, usually many of them answer only the first post in the topic or even just its title. If they'll start using notifier they'll won't answer anyway. Especially those ones who have a bunch of accounts. They are not really interested anyhow in what they talk about.