How rich is too rich?

In today's culture no one can deny we are constantly bombarded with the message that we need more stuff. Newer stuff. Bigger stuff. Cars, televisions, clothes, houses, junk food.
At http://www.globalrichlist.com/ you can put in your annual salary and see how your incomes compares to the rest of the world.
Knowing that the second greatest commandment is to love others like we love ourselves, and there are others without food or even water, what does it mean to follow this commandment when you are so rich compared to the rest of the world?

I submitted this to ReveLife today in response to http://www.revelife.com/revelife/690174114/judgment-the-well-dressed-pastor-with-the-corvette-and-mansion/
We'll see what happens.