Goodenuf
Warlord
I always thought that you only benefit from the first one; copies of a luxury don't provide any further amenities. That's what makes them great for trading to other civs for cash and/or luxuries you don't have. Perhaps I'm wrong?Typically, one copy of a luxury you have provides four amenities that are applied to four different cities. If you have four copies of a luxury, they'll serve 16 cities total.