Black is not losing anything by setting up this trap. It just so happens that its there. If white doesn't take he just plays c6 later and then there are all sorts of ways to play from there.
By the way after 6. Nxd5 Nxd5 7.Bxd8 Bb4+ 8.Qd2 black doesn't have to take the queen and can just play Kxd8. If white takes the bishop then black gets a tempo with his knight. You're just giving white a chance to mess up when you leave your bishop on the board.
But.. if white does not take the pawn - the 'bait', there is an issue with a poorly positioned awkward knight on d7
seayun, in the Queen's Gambit Declined, a black knight on d7 is quite common.
I would agree with you to some degree
It is a good trap because it does not hurt your position. You can still continue to play normally if white knows the trap. And the knight on d7 is very well placed, it supports a c5/e5 pawn break.
True true - I think that if white knew the trap and played perfectly and precisely, then, it may hurt, slightly, but it may be considered sound at the non-professional level.
Basic positions are
What next??
Ok But what if White knows the trap?
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Sea-Yun Pius C. Joung