I've been told by family and friends that I have too many decks of cards. And yet, more keep arriving all the time!
I have new decks, old decks, rare decks, and common ones. Decks I wish I never purchased, and decks I wish I bought a brick of. I'm also not really a collector, so I open them all -- sometimes not right away, but in time.
If you're interested in hands-on details about decks, definitely explore my shelf below