Yeah. When I saw the prices for sealed copies, I was like . I mean, if it were a $100 game sealed, I'd say yeah, throw that bitch up on eBay.
Speaking of which, I'm still debating on my sealed copy of Packy & Marlon for SNES I found for $3-5 at a Salvation Army six months ago. Every high value auction for it on eBay hasn't sold and the only ones that have are opened/cart only ones.
Yet VGPC says the game is worth a bill and a half in new/sealed condition:
And RarityGuide.com says it's a $158 game in NIB condition:
Yet I'm so leery about selling a new/sealed older game.
Does it have any of the original price stickers btw? When there's wear on a sealed game, one might automatically think reseal...but with stickers present the buyer might be a little more confident.
From what I've seen; sealed and CIB markets can be weird. If you have something hot--like the Einhander with drill hole which popped up on CAG a while back--it'll insta-sell. Other stuff will languish, collectors will tell you it's worth big bucks, but when it comes to buying it they won't and it'll always sell for you under-market (though there'll always be some other guy's copy in the woodwork that mysteriously sells for higher).
I've had CIB n64 controllers and a gameboy advance cib where I just tossed the boxes because no one materialized who wanted to pay the nebulous premium, and it got to where it wasn't worth lowering the price and still paying the shipping on the boxes. I'm not saying your situation is that bad, but when some collectors can't verify the seal they only want to pay what the price would be on a unsealed CIB with a beat box; it's all the usual tire-kicking.