I totally feel your pain, but in a slightly different way.
I don't post a lot of threads, but they usually get at least a few responses. (Though I have had a couple where I got nothing, even after I bumped it a couple times!) But what happens to me all the time is, I'll say something in a thread. No one will acknowledge it. Then later in the thread, someone will say the EXACT same thing, and will get tons of "Thanks" and people will quote it a bunch of times agreeing with it. Sigh. I feel invisible here all the time.