Right so i decided to use 150,000 MP to see how many Haunted House quests I can do and what profit i could make from the crystals.
I do have the double crystals giftbox.
I ended up with 126 crystals (84 quests) and each crystal in avarage (as of 08/07/26) is priced 17,000 so all together I could make potentially 2,142 million MP ..... next to the 150k I spent so this is quite impressive.
What I do to make myself do Elger quests is to go to gym, pick first pet, then look at the crystals I need and do quests as long as i get those crystals that I need. THE REST of the crystals go into the shop for sale!
Pick a next pet in the gym, see what crystals s/he needs, do quests again to get the crystals you need and put the rest in the shop and again with others pets.
I know you want to say why just not take crystals from the first lot of quests I already did. Well then you won't be making as much money then, that's why