I wouldn't take it personally, firemonkey, there are all kinds of reasons why some threads get lots of replies and others get fewer.
Particularly in the case of similar topics, what can happen is that, depending on the time zone when the most people are awake and on here, the first thread they see on that topic is the one they will post to. Then if they happen to run across the second thread on a similar question, they feel like they have already discussed that in the other thread.
The other thread, because it has a reply, is bumped to the top -- where others see it first also, and reply. So a pattern gets set up.
It's usually nothing at all do with who the person is who started the thread; I think most people don't even particularly look at that, so much as look at the question being asked and want to have their say, if it resonates with them.
Don't worry too much about it. It's similar to the feeling of being a "threadkiller" --- many people fixate on the feeling that they seem to always be the final one to post in a thread, and that nobody wants to reply after that, so somehow THEY have "killed the thread" and put people off posting!
Where usually what's happened is simply that the discussion has covered all points and is fading naturally.
It's very easy to feel like you caused something to happen or not happen on an internet forum board, but it's mostly not personal at all.