When I joined the forum I didn’t know it was practically impossible to change your display name and wish I had chosen something different. I have only seen members that are high ranking and have a lot of trust have their name change approved so I’ve never bothered to send a request. I also don’t think disliking your name would be considered a valid reason.
I'm sure that most members just hurriedly chose a username when they were registering in the forum and they later thought of more befitting names for themselves. Personally I was thinking that it'll just be an easy process to change one's name like as it's easy to change passwords but I noticed that it's not so. Anyway I've not had any reasons to change my username, besides this is an anonymous forum and I don't think that it's necessary to change usernames. The forum rules is what it is and if any member wishes to change their usernames for any reasons they'll have to follow the procedure, it's that simple.