I have no firearm that doesn't get shot on at least a semi-regular basis; turning them into display pieces does them a disservice.
I too have firearms and shoot each one as often as my work allows and also as budget allows. Fortunately I can fire my AR-15 where i work because they use military-grade 5.56. My Glock 36 is .45 ACP so those rounds are relatively inexpensive. And my remington is 12 gauge so those rounds are also easy to come by. None of my firearms are allowed ti sit idle, especially my grandfather's Mauser that he liberated in 1944!