Book of old moon

I wasnt planning to post this i even gave up on this but i saw retail prices the old moon book is same price as kamasylvia buff so PA calculates its price as its same as kama buff but our devs is just calculating what we had those effects in different items and they calculate those item prices and there you go 8k pearls thats 2k caphras or 2-3 costumes for 15days of old moon. We all know its not worth to buy it even if you use it yourself. My question is why gamez devs doesnt calculate it like PA did and make it same price as kama buff or maybe increase kama buff prices a bit but decrease that old moon its really useful item&buff to have but most of us didnt even used for one time.

So pls devs just think this through again and come up with some discount on the price its just ridicilously high, i see no reason to pay 8k pearls on it but i need other effects like villa and swapping between skill sets