I used to do this all the time and have had horrible experiences that have cured me of this. They are:
Marc Jacobs-loved it so I didn't use it, then felt as though it looked dated b/c I held on to it so long. I ended up selling it.
Pair of pants: "saved" them for the right occasion, until I went to try them on and they didn't fit.
Expensive maternity outfit-"saved it" for a coming home outfit from the hospital b/c it was expensive and I didn't want it to look worn when I left the hospital. It ended up too big once I was discharged.
Shoes: very expensive pair of patent shoes I bought and saved. Finally took them out of the closet and realized that they had color transfer on the patent and they had never been worn. I was heartbroken.
Moral of the story, nice things are meant to be used. If you try to keep them perfect & untouched, not only do you not enjoy them, the universe finds a way to spoil them anyway.