I think there are different types of collectors.
For me I open my games so I can play them, but I keep everything else (CE contents) in as mint condition as possible and far away from my son's hands.
I have a couple of games which are still sealed. These are ones that I hold dear to my heart, but I do also have a spare copy to play.
Very rarely do I sell my games, when I do it's usually a spare copy I've aquired somehow and it's a game I'm not too fussed about having an extra copy of.
For me I think it's a bit pointless to buy a game and then keep it sealed as you don't get the full enjoyment out of it, but that's just my opinion.
