Priorities change, some lose interest, bitterness, too much arguing, tired of people just trying to increase their post count, etc.
Those are a few of the reasons I have been given by some of our past members. I do miss seeing the posts of the elder Romer and his son, they were always quite amusing. I am pleased to see Hans response to this thread, unfortunately he too has been missing in action quite a lot recently.
People come and go, and message boards change. Hopefully these fine individuals will find their way back at some point in the future.