I just tell everyone that all of the guns are loaded with the safeties off and they don't even touch the triggers.
Having a working trigger on a prop isn't a deal breaker for me. However, the props with the working triggers and clickety-click actions get more play time.
I love my BSG Blaster from Matsuo. I had him build it on an airsoft so I can have the working trigger. 
Having a working trigger on a prop isn't a deal breaker for me. However, the props with the working triggers and clickety-click actions get more play time.