This likely because a lot of people (the majority?), like me, find VLC to "Just Work" (TM) and don't find any reason to sign up for the forums. I try and make it a point to thank authors of open source software I use, but often times I don't get around to it.
Me, my family and friends have been using VLC for about 4 years know and the only we've needed is to occasionally update to a newer version or download an installer for a new system.
You know, people usually scream at us, not thank us :D