The whole point of games is to play them! I certainly own sealed games that I'm not going to open now, but they were bought with the intent to play them. Then I didn't get around to it & the prices spiked- so now I have the dilemma of opening the copy I have, or selling it for profit & buying a CIB copy to replace it.
I do technically own one game I bought without intending to play it- for awhile I collected this Japanese doll/figure line called Pinky Street... they put out a couple games that came with special edition dolls. The DS games I could (and did) play, but the PS2's region lock meant that one went right on the shelf sealed. Ironically, I have since picked up a Japanese PS2, so it might get played yet! (It's an RPG & my Japanese isn't great, so we'll see!)