I use them because I never wanted to be more of a collector than a reader. The decks I got that were expensive (to me; that is subjective) and rare or out of print I got because I loved them and I wanted to use them, not just to have them. I gave a Whimsical and a Hello (they weren't oop then, and actually I think I did not even know that decks went oop then, either) I did not connect with to my then five year old daughter, and although she is respectful, two years later they look way worse than they would have if I had left them on my shelf, but they have been loved.
Of course, I also let her try on expensive cocktail dresses and my single pair of Jimmy Choos, and I set my table with the good china, and drink the good wine, because I think life is for living, and I intend to do that fully.
For all of my decks, I require clean surfaces and clean hands, and no smoking or drinking around them. I also HIGHLY recommend not using the riffle or poker style shuffle, because I really think that damages a deck more than anything else. I lay my cards down in random piles in a circle and pick them up in random piles a few times, then slide them over each other in my hands until it feels good.
I hope you love your new deck regardless of how you decide to use it!
