How many tarot decks?

How many decks should one have? Or If you have multiple decks, why? Do you like the design or do you have different uses for the decks? How many is too many? I currently have 1 deck and I fear that if I have multiple decks, some of them would not be used as frequently or at all. Although I must admit, there are so many beautiful, attractive decks out there. I see the appeal to have all that attracts me aesthetically. For context: I am in the tarot closet, so only very few people know that I use tarot (so I do not use them for readings for other people, nor do I display them in my living space), I do not believe in the supernatural (so I only use them for self exploration).