You have to upgrade your logging skills in gather ability screen and nanmu is not available from gathering team we have to obtain it through manual labour that's why it cost much gold
Bro just open 7 side account and do assistance quest of all of them everyday and you earn 10k everyday from each account and boom you earn 70k each day in one week you earn 490k and transferring gb to main account would lead to 400k-480k gb