If someone gifts me with something I already have and I know someone who would like to have it I see no problem giving it them. Now I usually don't wait for a reason to give a gift. I just say "can you use this" and if they say yes I give it to them. My sister is the exact same way. What's wrong with that?
As for clipping coupons sometimes I save $10 on my purchases. So I'm $10 ahead on something else. I think that's like seeing a $10 bill on the ground and not picking it up but walking right by. That ain't me.