I sold my Mario Party 3 along with a game music cd from a Famitsu magazine for $45 a few years back, and it took a long time to even find someone to buy it. I've seen it listed at very high prices before, but I have to say the actual demand is minimal.
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Star Fox w/OBI for $150?
I picked up a copy of Star Fox with obi for 8800 yen:
I think that in general, when the seller doesn't show the obi in the main photo, an auction will generate less interest than it otherwise would - and that can be an opportunity for a good deal.