I can see a purpose why some would not want thier real name used.
I use my own name & picture.
1. I am secure in who I am.
2. I do not hold office, nor do I want to.
3. The same thing I post on this forum I wouldn't be ashamed to say in Church.
There is one disadvantage to having your real pic on the forum though,
People can not see the resemblance to Brad Pitt in my facial features!