The default gain location is indeed your discard pile. Then cards can tell you to gain to somewhere else, for instance Develop tells you to gain to your deck.
Den of Sin says that it's gained to your hand instead of to your discard pile. You can view that as Den of Sin having a different default gain location. You can also view it as an effect that competes with Develop: Since Develop wants to put it
on your deck, Den of Sin can't redirect itself to your hand
instead of to your discard pile.
From my rules document (Renaissance cards not added yet):Den of Sin, Ghost Town, Guardian and Night Watchman are gained to your hand instead of to your discard pile. But Armory, Artificier, Develop and Graverobber will instead gain them to your deck.
Nomad Camp is gained to your deck instead of to your discard pile. But Artisan, Cobbler, Transmogrify and Wish will instead gain it to your hand.
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