I make my own hand-sewn and embroidered or crocheted bags for my decks. I keep the boxes separate from the decks. Sometimes I use the pictures on the box or on the extra cards to make tarot jewelry.
For me, using the tarot cards, trimming them, colouring the edges and making the bags, is part of the bonding process.
I keep them in a large beautiful cardboard box together with incense. I love the scent on my hands after I handle a deck that was "marinated" for a long time. The longer I have a deck, the stronger the scent. I like that but I'm sure that many people don't. Tastes are different!
My decks are stacked upright and sorted into "families", each deck with its LWB (which I rarely use after I read it when I get the deck but I like to keep it close...."just in case"). From time to time, I sort the decks, and I try to handle them all regularly. Re-sorting them in different ways (sometimes the suits in order, sometimes the numbers together) and shuffling them regularly keeps them "warm" and lived-in.
Next to my laptop, I always have a deck (today, it's the mini Harmonious), and usually also one in my bag. I feel that keeping them close and handling them is not only good for me but also for them.
While I treat them well, I like the signs of use, like I do with my books and other things. They show the passage of time, and that's fine, I'm going with the flow and don't try to stop it although I'd sometimes like to.
My spread cloth is spread over the cards in the box. It's a black Indian cloth with little embroideries and mirrors, and it has the perfect size. I was very happy when I found it many years ago.
I use beautiful silk that I painted myself or special yarns for my tarot bags. Sometimes, my mother buys little linnen sachets for me and I use them for my decks, but mostly, I use bags I made myself.
I'm careful to shuffle them nicely but if the cards are stiff, they get some rounds of riffle shuffling. I played Patience for many years and liked the middle crease of a well worn Patience deck. I wouldn't like that for a tarot deck.
For sticky decks, I tried the talc routine but it didn't help much. I'll have to experiment a bit.