In 2008, LEGO released 3 Factory sets across 2 subthemes, all of these sets have been retired. Subthemes for that year included Custom Cars and Space. For that year, the total price of all retail sets cost $270, today those sets are valued around $559, a growth of 107%.
Most valuable 2008 LEGO Factory set
10191 Star Justice $281.83
Largest 2008 LEGO Factory set
10192 Space Skulls 956 pieces
Most owned 2008 Factory set
10200 Custom Car Garage
3 sets

10191 Star Justice

Theme / Subtheme Factory / Space
Year 2008
Pieces / Minifigs 895 / 8
Availability Retired
10191 LEGO Factory Space Star Justice
Retail $99.99
Value $281.83
Growth  +181.9%
Annual growth 5.8%

10192 Space Skulls

Theme / Subtheme Factory / Space
Year 2008
Pieces / Minifigs 956 / 4
Availability Retired
10192 LEGO Factory Space Skulls
Retail $99.99
Value $152.80
Growth  +52.8%
Annual growth 2.2%

10200 Custom Car Garage

Theme / Subtheme Factory / Custom Cars
Year 2008
Pieces / Minifigs 893 / 4
Availability Retired
10200 LEGO Factory Custom Car Garage
Retail $69.99
Value $124.27
Growth  +77.6%
Annual growth 3.8%