I add things to my wishlist also for "anticipating" sales. Once you have done WAGS, CVS, or even your local grocery stores. You KNOW what is going to be on sale and you put those things on your wishlist. Also, the sneak peeks do help. I also put things on my wishlist that I just "have to have" because I can't find it. I know, silly, but most of them do turn out to be good ones. I look at the database a few times a week and see what are the new blinkies out there, what are the new tearpads out there. By doing that I see things I may have missed and I add them to my wishlist. It is a "wishlist" and I can have as many wishes as I want. :)
Also, I ride a lot of trains so what I can't use, I can pass along. If I am on a round robin train, I will look at the person I am mailing to and add things from THEIR wishlist to my wishlist in hopes I can get something for them I can pass along.