Does the Preacher affect the Booty/Loot on the ship or in a den?
The rules don't specify, but my interpretation agrees with this player aid in that it's meant to be your booty tiles.
EDIT: A BGG post from Stefan Brunell the American publisher here confirms this.

[Q2:] The Preacher has a Dusk effect of &quot;Remove all but one booty token.&quot; Is this referring to that day's booty, or your own inventory? Do the removed tokens go back to the bag or do they end up in your inventory?
Second: Own inventory, to the bag.