Haha, I am having the same problem. They just don't understand... I have a couple good reasons for save the dates...
-I am from Ontario, but live out East now. I have to let my family in Ontario know my wedding date in advance, so they can hopefully booked their vacation and come to my wedding. Most people have to book their vacation far in advance.
- My sister is getting married a couple months before me. We want people to know both our wedding dates in advance.
I also had to explain the importance on response cards to my fiance. He wanted to make a website for people to RSVP. Fine for him maybe, his friends are all computer programmers and he has a very small family... most of my guests are older and don't own computers... Haha.
Silly boys... Hahaha.