User blog comment:Dopp/Meet More Wikians with Improved Profiles/@comment-10370-20110802173836/@comment-38.127.199.123-20110802190628

Yeah, the mastheads will be editable by staff and VSTF, but not by admins or other contributors. They're global across wikis, so if wiki admins could edit them, then all you'd need to do is create a new wiki -- you're an admin there, so basically anyone would be able to mess up anybody else's profiles. :) That system seems to be working well for troublesome avatars; it should be the same for masthead stuff.