Thanks for the input, everyone!

I must admit I'm keeping the boxes to try and add to their figures' resale value. As much as I like to think I'm buying figures to keep for a long time, I know that some will have to go to make room or money, or even just because I don't feel the same way about them anymore, and I'm thinking that boxes will not only add to resale value, but will help to protect a figure on its journey to its new owner. Still, people buy loose figures all the time, and I have personally bought loose Masterpieces, so...