This was a pretty ignorant opinion. Nothing to offer them? We don't know how unique our planet and the materials found in it are in the grand scheme of things. Yes, gold might be useless to us at this point in time, where we don't have many good uses for it, but if we are talking about a civilization that is possibly million years more advanced than us, how do you measure the significance of things that are found on our planet, or even the planet itself? What if any of the numerous elements found here that we consider insignificant are of great value to their survival and are not easy to come across? I do not think that we can state opinions like this when we have so less information about what is out there