Whats the catch?

What's the catch? I think this qualifies as one of those "if you have to ask, you don't want to know" type of situations. Seriously, Google them.
It's a lot like the way you trap an animal....first, you put out some nice-smelling bait...then you put tension on the snare...then you wait for an unsuspecting animal to wander on by...when they show an interest and move forward to take the bait....WHOOSH! You've got them with a rope around their....uh....leg....
So its more like buying a used camera from some guy basically right.

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