Originally Posted by
Aurboth
From this list:
Improved Farm: 845 gems x 4 = 3,380 gems
Arctic Iron Mine: (295 presents @ 300 gems/100 presents) 885 gems x 4 = 3,540 gems
Improved Watermill: (595 presents @ 300 gems/100 presents) 1785 gems x 1 = 1,785 gems
Improved Storehouse: 750 gems x 5 = 3,750 gems
Watermill: 895 gems x 2 = 1,790 gems
Silo: 750 gems x 2 = 1,500 gems
Total = 15,745 gems
Gems Spent = 24,500 gems
The decorations do cost presents, with the christmas trees between 40 and 60 presents if you were to buy, with 3 in a pack of decorations. The store value would be about 150 presents, or 450 gems, and with 21 of them would add another 9,450 gems. This would push up the total to 25,195 gems and already exceed what was spent to get 70 of the boxes. The Gingerbread house, the Frozen Manor, and the 7 White Castles are just bonus if you include the decoration cost.
Since we would not buy the decorations, the 9 population builds were gained for the difference of 8,755 gems. The only reasonable data I can take from the market is 20,000 gold for the white castles, which even using a 10:1 coin:gem ratio puts the player ahead on the white castles alone (14,000 gems), with the extra gingerbread house and frozen manor just being the bonus.
Generally, it looks like they just set the prices to put the players somewhat ahead by buying the boxes. It is not the killing that happened with the lower priced boxes, but it is hard to call them a 'rip off' with the returns being reported.