So in terms of electronics, it is sought after. That is more technical however. They also used it for technical equipment. It was also used in healing techniques. It was one of those all-purpose substances.
Gold is a universal substance.
Maybe those ETs were in debt to other members of their society just like we are here. That is correct. It is a chain of debt and family dysfunction. There are other, almost mystical reasons for your forefathers' hunger for gold. These reasons would not necessarily make sense for us to explain them now.