Long threads are often what what i call " tea room threads" i.e what book are you reading.
Then we have what i call the controversial " stand me up and shoot me down threads" ie i am a Christian your an Athiest or visversa.
Political and current affaor threads often result in the loss of valued members.
Reward good behaviour and respect of fellow posters opinion threads tend not too last very long.
Terry your the master of intersting and thought provoking threads, that get few replys. ( with the odd exception)
Anyway you long thread posters on this board, do a little shopping around, the best threads often end on good terms but with out many posts.