Right - i have this problem too. I have developed a strategy to get more replies...
If you bump your thread in the daytime you are more likely to get replies. Check your thread every day so you can reply while the thread is still hot on other posters 'threads i'm on' lists - do not ever be ill, or god forbid, busy with RL, because you are missing out on chances to prompt more replies.
Last but not least, do not have a boring life like mine - start a thread involving something highly embarrassing or controversial and give it a title which will attract lots of attention.
Now if only i could think of something interesting to post about...