This my seem silly but its kept me out of trouble and away from burning out. Not everyone is like me (thank goodness) and you just have to find whats best for you...even if that's a sealed experience.
Nothing is silly in that hobby, i think there is as many way of collecting than there is people who collect, look at me for example i don't like making money with my hobby so i don't sell my dupes, i try to trade them with others collectors or i give them away sometimes (and that is, for most people, really silly right
?). I even knew a PS1 & PS2 collector who didn't care about the games, he only care about the boxes (i remember that he sorted them by item numbers, and he didn't even care if the disc was inside or not, the only thing that mattered was the spine, it needed to be perfect).
Back to topic, i think i already answered that on another thread but i don't really care about sealed games, i always buy a game with the intention of playing it and the plastic around the box prevents me to do it (well... most of the time i pass on them because the price is too high anyway), but it happens sometimes that i find one cheap (it happens a lot with PC games, they're so cheap that people buy them by lot but don't even have the time to play with them, they don't even bother to open them).
Recent games that i find sealed (X360/PS3/Wii or more recent, and DVD case for PC) i open them directly (i don't even bother checking if the game could be rare or not), for games more ancient than that i try to trade them with another collector for a CIB copy of the same game (of course without the bothering thing around it
) and sadly if i can't find anyone to trade it with... well the next time i'm in the mood to play with it i will open that game without hesitation (right now i actually have one sealed game to trade but after more than a year i found no one to trade it with, it's a PAL UK/FR variant of Ace Combat Advance, but i'm not in the mood for some Ace Combat lately so the plastic is safe... for now).
Another reason that i don't collect sealed games is basically what oldgamerz said previously.
What if you keep a video game sealed for years and years. and whoever opens that game finds no game in the box or sealed case?
I have a terribly bad luck when it comes to new games, sealed boxes without disc inside or with the wrong disc... it happened to me more than a few times, so with my luck this sort of things will probably happen.
My first bad luck case:
Resident Evil 2 was one of my birthday gifts for 1999 but i was too focused on FF7 (that i got at the same time) to even bother opening it until months after...