Review Detail of Iring_na_itom in Fey Evolution Merchant

Well I like the story 😉 but I give you 3 🌟 xD because I found that humans here are rather useless .. hehe . I've read it till chapter 225. it is indeed like what author said it's all about "fey" or the monster beast(pokemons) and his interaction with humans is scarce. Author explained well about the Fey's Grade/Quality but I just don't understand the what benefit is the cultivation of humanity there. are the only purpose of humans energy is to cultivate beast? like mc in chap 225 he is in c lvl (d➡️c➡️b➡️a) .. he use his energy for his fey to use their skills and that's all . it isn't explained what other uses of the energy.. like can it strengthen human body? can it prolonged life span? and most of all in the title "fey merchant" but he isn't that focus in selling.. well he just need to upgrade fey so that he can also upgrade his energy lvl and sell excess fey he didn't use.