Many moons ago, I bought one gun safe. I told myself that I could only have as many as would fit in the safe; it was on the smaller side as gun safes go.
This worked for many many years... until one day a relative asked me to store one of his rifles in my safe... now, you know now that someone else's rifle was taking up room in my safe... ok, now I have two safes...
And if I can keep from getting a third safe for about the same amount of time...
I personally don't see it as an addiction, I see this as a well thought out and reasonable growth plan, all things considered...