In 2004, LEGO released 2 Bionicle Accessories sets, all of these sets have been retired. For that year, the total price of all retail sets cost $22, today those sets are valued around $355, a growth of 1516%.
Most valuable 2004 LEGO Bionicle Accessories set
8711 The Ultimate BIONICLE Set $344.90
Most owned 2004 Bionicle Accessories set
8613 Kanoka Disk Launcher Pack
2 sets

8613 Kanoka Disk Launcher Pack

Theme / Subtheme Bionicle / Accessories
Year 2004
Pieces 4
Availability Retired
8613 LEGO Bionicle Kanoka Disk Launcher Pack
Retail $1.99
Value $10.37
Growth  +421.1%
Annual growth 6.4%

8711 The Ultimate BIONICLE Set

Theme / Subtheme Bionicle / Accessories
Year 2004
Pieces 702
Availability Retired
8711 LEGO The Ultimate BIONICLE Set
Retail $19.99
Value $344.90
Growth  +1625.4%
Annual growth 7.0%