I think Goozex should make Sega Saturn and N64 games available for trading. Both systems have many hard to find games that people are interested in playing and i'm sure there are many people that would be willing to trade games from their collections for other games they always wanted to play.
I don't think it's up to Goozex. They use a third party provider called Muse, if their database doesn't have N64 or Saturn games, then it's not a game that's tradable here.
A quick search of the forums will reveal many other threads with in-depth explanations about why retro games are not currently traded on Goozex.
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