In 2015, LEGO released 4 Creator Promotional sets, all of these sets have been retired. For that year, the total price of all retail sets cost $9, today those sets are valued around $44, a growth of 387%.
Most valuable 2015 LEGO Creator Promotional set
40140 Flower Cart $22.81
Highest growth 2015 Creator Promotional set
30284 Tractor +99.40%
Largest 2015 LEGO Creator Promotional set
30285 Tiger 73 pieces
4 sets

30283 Off-Road

Theme / Subtheme Creator / Promotional
Year 2015
Pieces 43
Availability Retired
30283 LEGO Creator Off-Road
promotional
Value $4.98
Annual growth 4.7%

30284 Tractor

Theme / Subtheme Creator / Promotional
Year 2015
Pieces 51
Availability Retired
30284 LEGO Creator Tractor
Retail $4.99
Value $9.95
Growth  +99.4%
Annual growth 5.5%

30285 Tiger

Theme / Subtheme Creator / Promotional
Year 2015
Pieces 73
Availability Retired
30285 LEGO Creator Tiger
Retail $3.99
Value $5.97
Growth  +49.6%
Annual growth 6.0%

40140 Flower Cart

Theme / Subtheme Creator / Promotional
Year 2015
Pieces / Minifigs 71 / 1
Availability Retired
40140 LEGO Creator Flower Cart
promotional
Value $22.81
Annual growth 3.5%