I read many (app. 10) forums each day (English, German, Danish) and I feel welcome in all these forums. But I do not have the time to read all threads in all these forums (Remember that only the Danish of these are in my native tounge. Takes a little longer for me to read the discussions).
My point is: If the thread subject reflected the discussions it would easier for me AND ANYBODY ELSE to find the threads to read if I/they for some reason have to give priority to some threads. Just like reading only some parts of a newspaper based on the article heading!