I hung out at other forums before coming to FR (as a lurker) around 2003 or so. In the places where I used to post, it was considered very bad form to not create a personal profile. Matter of fact, people who didn't were looked upon with a degree of suspicion. It was just considered a courtesy to the community to let everyone know who you were.
When I finally created an FR account, creating my profile was one of the first things I did.
I have never heard of that before. I would have suspected many create false images of their lives there anyway in order to troll and disrupt, so I know I would personally never have taken any profile at face value anyway. However, I'll consider the idea that some may think it is impolite. Thanks for giving me that info.