Air Arms Crosman 140 Storage

I have searched and found a copy of the owner's manual of the 140 on the internet and it says "when storing it, release all air pressure."
Based on what you guys say and your experience, I think I'll pump it at least once prior to storage. You've apparently had no bad experiences with keeping a few pumps in your air guns. Why it's recommended in some and not is others is beyond me.