I like buying Amazon Warehouse deals when the item makes sense to me. With larger items I think their quality control is higher, and the saving tend be bigger. The box may arrive super beat-up, but item is just fine.
My motivation is probably less about overall savings, but more about me feeling like I'm doing Amazon a favor. Weird, isn't it? I'm conditioned.
As a tangent: I've also purchased used that ended up being a return of a similar looking, but much less expensive item. So I just re-return it. In this case I assume it was fraud on the original return. With my patterns I doubt Amazon thinks -I- returned them the wrong item. Without customer context their job figuring stuff like that out would be much more difficult.