I open everything now. I used to be a stickler for keeping things in boxes and in mint condition. Soimetimes it worked out and when I got fed up of said collection I sold it and made a good chunk of money, other times things ended up worthless and left in my parents loft to rot. The balance between profit and loss usually meant on a collection of something I'd pretty much break even, if not have a small loss.
This made me decide to just start opening everything and enjoy it for what it is. I like that I can see all of the details on the figures and actually pick them up and mess with them and psoe them. All my NECA GB's that I had kept in boxes, my 12“ Blade figures that were mint have now been opened up and I'm so glad I did it. Granted my Gozer broke within a few weeks but I figure if I ever sell any of it it's because i'm fed up of it and not because I'm trying to make money so it doesn't matter.
I totally understand why people keep things in their original packaging but it's not for me anymore. I'm looking forward to getting some of the new 6” GB figures and will rip the package open straight away. I'm even tempted by the 12" 2 packs set to be coming out and would love to have those loose, especially with the interchangable accessories set to be coming out.