When they extend maintenance and when it comes up after a 2-3 hour delay earlier than they expected it seems like they are waiting for a "Thank you" note.
Kinda like "We made you wait 11 hours to play a game you're paying us to play, but look at the bright side, we could've kept it down much longer..."
I honestly don't see why people get so upset at maintainance. There are other things to do besides WoW. It's not like blizzard is sitting on their huge stacks of money and randomly pulling the plug, they're working to keep this game, our second life, functioning.