well There is a mission "Ethereum Heist " From Galiano Once you Finish "Kill Garth once and for all" It will give you around 800000 if I remember correctly But I didn't give The Ethereum to Galiano Because I want to know What I can do/use it in the future so I just whore him out non stop , sell my junks, play sloth in casino etc. But It cost me so much time in game now I'm at Day 409