In 2006, LEGO released 2 Bulk Bricks sets, all of these sets have been retired. For that year, the total price of all retail sets cost $3, today those sets are valued around $41, a growth of 1274%.
Most valuable 2006 LEGO Bulk Bricks set
Grey Brick Separator with Black Frame Pieces $21.12
Highest growth 2006 Bulk Bricks set
Flags and Posts +1904.04%
2 sets

Grey Brick Separator with Black Frame Pieces

Theme Bulk Bricks
Year 2006
Pieces 56
Availability Retired
LEGO Grey Brick Separator with Black Frame Pieces
Retail $1.99
Value $21.12
Growth  +961.3%
Annual growth 9.2%

Flags and Posts

Theme Bulk Bricks
Year 2006
Pieces 100
Availability Retired
LEGO Flags and Posts
Retail $0.99
Value $19.84
Growth  +1904.0%
Annual growth 6.9%