I'm guessing some people use it as a stepping stone to get to know what lays ahead in their journey and once they've reached a certain point they feel like it's time to move on...
I have done lots of reading on this forum and have read very old posts and have wondered how those people are doing, especially when I read posts about them having problems who venting about something -- I just hope they're happy now!
Not that anybody cares since I have still a noob to the forum compared to others haha but I just tend to come and go although I love the support this forum provides it kind of reminds me of certain things which I sometimes like to avoid.