Nice to hear from you. Let me answer your questions. I saw same TV program too. I think one of the reason, some japanese peple began to eat oversea foods. They undergoed to eat many kind of japanese foods.
I often use onlineshops,because it's very usually.conveniet. But get the groceries from their shops is not very much. Our health endangerde by buy food online.
Giving tips is good custom. I felt it when I went to the Canada tour. I got hostibilty afer I gave tips anyone.