When I got my first more expensive knife I was pretty careful using it. And I cared quite a bit about it so that it doesnt' get lost or anything. After I got my second more expensive knife, i got a lot more laid-back about it - because even if it got damaged or lost, I'd have another one sitting on a drawer... And I'm still careful with all my knives and I haven't lost or destroyed any (yet?), but I don't really worry about them.I never carry my one custom slip joint. That's why I don't buy any more.
And I dont have highly expensive customs (only one ''custom'' fixed blade that ended up being the knife for shaving) but some handmade knives where it worked pretty much like with my first more expensive knives.