I think I went through about 100k in the cooking ingredient levels, but that's cus I got asked for Dakota paw alot -.- then Id say 700-750k in total for the poisons, but that's including a couple I bought for MP instead. But you get about 2mil MP plus voodoo costume as rewards before you finish it, then 750k and a Yuni maker, plus I got some good stuff from eleka goals on the way, so it worked out pretty well.
If you are doing it for eleka goals, hold on to the voodoo costume as one of the goal levels is to use it on a pet