Code:
	You are the 1st Mobster to join this fight. Help defeat the boss to earn rewards.
You earned  +1 XP for joining this Coop Boss Fight.
+$1,320,528 | +456 XP | 264 Health Lost | - 20 Stamina | 54,596 Health Damage Dealt
 I sometimes only get +1 XP for joining boss fights,  but other times i get 60-80xp,  not sure if that's a bug or not.  
Also with Challenge Help I was getting 100+ XP, then it dropped to the 30's, now it's always just 1 XP.  but i have been doing alot of helping since the spooktober calendar just came out.