The single bloodier key is currently risk free content. Anyone can grab d'hides, 20 brews and run the key home easily without problems. Because you don't need fighting gear at all, this is very easy to do.
To spice things up a bit, I would make the risk brackets work in the singles even when carrying the key. By doing this, you can't get boltragged by suicide accounts who are risking nothing.
Would make the event a lot more interesting.
Also, make it so when bloodier key is dropped by the holder it will show-up only to the one who has done most damage.