Sanraku

on supply and demand.
 * Trade him Soul Plates to receive Zeni.
 * Can only trade a maximum of 10 Soul Plates to him per game day.
 * You will be awarded larger amounts of zeni by submitting Soul Plates of the monsters Sanraku is currently interested in the most.
 * Sanraku's interest changes from one to three game days, and on some occasions this can change from two to four times a day. Which was confirmed on the Phoenix server.
 * Ryo, Sanraku's assistant will tell you which monsters are his current preference.
 * The formula which determines the zeni received is not known, but there are many theories.
 * Having claim on the mob you take pictures of increases zeni reward significantly.
 * Lowering the mob's HP before taking pictures increases zeni reward.
 * Level of the mob the picture is taken of might influence reward as well.
 * Charges an erratic amount of zeni for information on "Rare Fauna."
 * If you select this option, you may choose from a list of Notorious Monsters (NMs)
 * If you agree to pay the necessary amount of zeni, Sanraku will tell you where to pop the NM, and give you the appropriate "pop item."
 * At first, you will only be able to choose from "Tier I" NMs.
 * By defeating these NMs and bringing their "Trophies" back to Sanraku, you will receive a key item and unlock additional NMs.
 * It is unknown at this time what factors determine the amount of zeni Sanraku demands.
 * Its not specific but SE did say the amount of zeni needed for each event depends
 * Charges 500 zeni for information on how to get to the Islets.
 * Islets appear to work like the God's islands in sky. There is a ??? in the center that is used to spawn one of the NMs, and once the NM is spawned no one else can enter the Islet.