I am blessed, I have too many guns to shoot them all; though I could and would shoot any one of them if I wanted too. If shooting "everything" were made a "rule", I'd have to give some up.
All the reasons above for shooting or not are good sound advice/reasoning/choices.
So the "bottom line" is do what you want- after all, they are "yours". Enough lugers and other collectibles have been "preserved" for posterity already. JMHO
We all have likely "lost" more $$ on other endeavors or investments than if we "broke" a matching part on a luger.