TLDR:
Wargaming, why don't you just make an option to buy an X amount of boxes and let the user choose how to divide it by the 4 types.
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I was looking into buying some boxes. I enjoy playing the game on and off for a period of 7 years. I don't mind paying some money to something i enjoy every now and then.
To optimize my changes to get all the christmas decorations, i thought about buying 25 of each type. Sadly, there is no option to buy 100 boxes, with 25 of each type. If i want to achieve this, i have to buy 25*4 times boxes. This results in 160 euro for 100 boxes. Yet, when i buy 75 boxes from 1 type and 25 more, i "only" pay 140 euro. If there was an option for buying 100 boxes, it would be even cheaper (i guess?)…
Come on wargaming, i don't mind giving you money, but this is just forcing users to spend more.