There are two schools of thought on this.
One the one hand, when you die in 6 years or 60 years, and your wife's next husband gets his hands on your collection, you will want every one of your knives to be covered in drywall dust, biscuit gravy and kangaroo blood - just as a way of marking your territory. "Yeah, you have her now, but I was here first. You know - when she was still young and hot."
OTOH, why abuse and destroy a spendy or unique knife, when you could beat up something more common and less spendy?
I see both sides, but tend to come down on the side of not destroying my NIB carbon fiber Military that's probably worth $300, when I could beat up a user Military that cost $100. But that's just me.