You raise an important question smiddy and have received some very good responses.
Many long time posters have been involved in long debates battling to defend their point of view. This is therapeutic and helps to resolve the issues that they came here with. In time their agenda changes and they leave. Often they find they no longer have an agenda but hang around having a little fun until boredom causes them to fade away. Like every playground we do eventually outgrow the class and find a more fulfilling pastime.
I use the word ‘agenda’ because the most prolific posters on this board have an agenda that they feel compelled to push. They are on a mission. It could be that trying to convince others that they have ‘the truth’ is a way of convincing themselves that their belief is the right one.
Heavy debates invariably lead nowhere. They often degenerate into cat fights with name calling and personal insults. Stirring the pot is not for everyone and sometime the light relief of a fluff thread is a welcome respite.
'It is better to keep your mouth shut and appear stupid than to open it and remove all doubt.' Mark Twain