Because I don’t want to pay $60 per couple per day over a 2 or 3 week cruise when there is probably only a few things I ever order in Crown or Sabatini’s and the Catch menu has very few things my wife can eat since she is allergic to most ocean white fish. In addition I enjoy the Reserve dining area which I find more relaxed and quieter. We rarely eat in SD’s more than maybe 4 times on a 16 day cruise