The Inspector wrote:
Next time you are bored, click onto the 'members' icon @ the top right border of each page in this forum and checkout how many people have become members but have never posted or posted only a very few times.
Obviously these folks at one time thought they had something to contribute, but failed or were scared off by something and now are just a number in this forum.

Every board has a group like that. The people sign up for different reasons and may depend on the board:
- Some boards do not allow a person to view photos or video without being a member (makes for a vastly inflated number of members)
- Some board have hidden areas which only members may see
- Some folks like to be able to use the "new posts" or "posts since last login" type features to stay on top of things and one needs to be a member to use
Why they don't post could be:
- Any of the above reasons including the quoted one
- Got busy, forgot password (too lazy to request it), and haven't returned
- This board has sooooooo much information that it can be extremely overwhelming to a new person and he/she feels intimidated
Just a few off the top of my head.