Much of my gear is both new and used simultaneously. My amp and linestage, for example is "new" in that a custom builder made it for me, but virtually all of the parts in it are used and vintage, some transformers being as much as 80 years old or so. My speaker system I bought new, but, I replaced the midrange compression driver and horn with a very old Western Electric combination (713b compression driver and KS12035 horn).
New vs uses in your current setup
Curious the ratio new to used/demo in your current system comprised of.
I’m equally split on a “per box” basis although I tend to look for used cables almost exclusively.