Use it or lose it.

Things last better when they are used. With a few exceptions. China breaks, DVDs scratch. But, I think there are only a few exceptions. Although books get a bit scuffed from being read, it still helps keeps them fresh, lets the air into the pages. Books that have sat closed on the shelf for years get spotted and musty, which is far worse. Same with shoes and bags and clothes. At my house, they get mouldy. Wearing them gets them out in the sun and fresh air.