Just as an update to my last post -- I was cruising around in Dalaran when I saw the following advertisement:
I did some investigative work and found the guild's website. Those are indeed the instructions, and they are serious. The 25,000 gold gets you the title and achievement, but no loot. Guess you can't ask for too much! As of today, one person had applied for himself, and was suggesting that his brother might also want to pay. What the heck, it's only pretend gold, right? Still, I can't imagine feeling too good about a Kingslayer earned this way.
I expect I'll actually have something more useful to say about other topics later in the week. My brain is once again not cooperating too much with me.