With the effort required to track it down, the several deaths it takes to kill (assuming it's a fresh spawn) and the rarity of the boss itself (one time a year for a limited period of time), you would think it might have something worth while for a drop. An incentive to kill it.
Some ideas tossed around this house when I told the roomie about the boss;
-Higher accuracy weapon that does worth while damage or status effects that work
(melee, 35% base accuracy, 5-9 Dmg or Ranged, 35% base accuracy, 5-9
-Huge healing cache - Krampus has to heal all the beatings he's taking somehow
-A crafting use for the trash he drops
-Access to a Krampus Village (small area with unique search finds, players respawn on the main map when the event is over of if they get killed)
-A cock rub and an attaboy
-Since it's based off the scroll guardian, have him drop a scroll...that has the names of all the good girls and boys, the list looks awful empty.
-Your home phone number
-Your ex-GFs phone number
-a naked photo of a cat
-a Krampus-mobile - allows movement in a straight line for 2-3 tiles for 1 AP, runs on gas
-A Rocket Launcher with Rockets
-A sniper rifle that targets 1 tile away
-A crafting recipe guide book listing all 3 of the crafting recipes you've actually put into the game
(seriously, you advertise crafting on the FB page but there's nearly none of it that's been found)
-A god damn fucking joint, I man seriously...Someone in the game has to be holding.
-Reinforcements for building barricades, so the barricades can only be brought down with explosives (only need one explosion to turn back to EHB)
I've given a good list (some joke, some not) of directions you could have gone. I know you and Mams have always been fairly "DON'T TELL ME WHAT TO DO!" about the game but where's the carrot? All I see with Krampus is a stick.