
wkover |

I purchased the add-on decks for all four campaigns. These were four-player campaigns, and we only added the unique boons to the box. We didn't want to clutter up the boon pool with duplicates.
I'm also in a 5-player Mummy's Mask campaign, and we only added the boons from the Character Add-On that certain characters might want (e.g., extra alchemical items for the Alchemist).
But as stated above, do whatever makes you happy. :)

Hawkmoon269 |

Here are some links discussing it.
Some people (me included) just leave the character add-on deck in all the time, regardless of the number of characters. Others take it out. Still others have house rules, leaving just certain cards in when playing with 4 or less.
The same rule applies to adding in class decks outside of organized play. It is technically all or nothing.