This is actually how I get good deals on some sealed, rare games. I've bought games under the condition that if I get them for X price, I HAVE to open and play them. This has been the case with Burning Rangers for Saturn, Mushihimesama for PS2, and a SLEW of hard to find imports (Radirgy, Ikaruga, etc).
I never thought to tape them, but I stand by my word that I'd opened and played all of them (and they're all AWESOME).
I'm about to crack open numerous sealed imports I just got in the mail, as well as some sealed Genesis games. The problem is finding opened copies to get in exchange for the sealed ones. Once I traded rarebucky a sealed first print Border Down + Trizeal for Trizeal and a handful of mint GBA games. Totally worth it to me even though I didn't get a Border Down in return, since I've played everything. I just had to go out and buy Border Down after. :-P
Either way, I look at it like this: if someone opens a really rare game, and I have a copy sealed already, great. Good for me. Mine's worth more.
And, good for the person that opens it. As long as it's a good game, they have a great game to play!
