100% guilty of this...
I had 1 - and I was happy. It was nice. It was my favorite thing.
Then I got a 2nd one. Suddenly, I needed more. I needed them all. It felt like Pokemon.
Now I have over 160 of them. Oh god help me...
Knowing not to own 2 of things to avoid collecting more things is nice. It's strange that it seems to only require 2 of some 'thing' to create an urge for a collection. I'll need to start throwing more things out. Pick my favorite of the two and give the other away.