also
because they are random and you're in act IV, you have the potential to be further disappointed.
in act IV BFs there is no dungeon 6 key - thus you cannot finish completely anyway.
when i ended the game i had 4 of the 5 BF merchant quests unfinished as the first 5 dungeon produced only on quest item - the remaining 4 would (probably) have been found in dungeon 6.
oh well.
by recognizing this you may avoid further disappointment.
