"Therefore you will be among the first to go into exile; your feasting and lounging will end." NIV translation
Because of their excesses, the rich would be the first to be judged. This reminds us of the fact that prosperity also brings responsibility. It is also a reminder that we, as Christians, are entrusted with the responsibility to share the most valuable thing that we have which is our testimony of what God has done and is doing in our lives.
"The Sovereign Lord has sworn by himself - the Lord God Almighty declares: 'I abhor the pride of Jacob and detest his fortresses; I will deliver up the city and everything in it.'" NIV translation
When God declares something, then, it is done. There is no court of appeals or nothing with the power to overcome the will of God.
We see that the root cause of all of the sins and the coming judgment was the pride of the people. They forgot that everything that they had was given to them by God and began to think that they had earned it for themselves.
We remember that pride was the original sin that caused Satan to be cast out of heaven. It was what was at work in Israel during the days of Amos and it is what is widespread in our world today.
"If ten people are left in one house, they too will die. And if the relative who comes to carry the bodies out of the house to burn them asks anyone who might be hiding there, 'Is anyone else with you?' and he says, 'No,' then he will go on to say, 'Hush! We must not mention the name of the Lord.'" NIV translation
The judgment will be so terrible that, if any survive, they will be afraid to even mention the name of God. The purpose of the judgment is to plant the fear of God into the people's hearts. The purpose of the fear is to bring them to repentance so that they might be saved.
"For the Lord has given the command, and he will smash the great house into pieces and the small house into bits." NIV translation
The judgment will be total; on the poor as well as on the rich as we see by the sizes of houses.