I have slightly more than 200 tarot decks, and 20-ish oracles. No, there is no such thing as "too many" decks. I love having such a variety to choose from; there is a deck for every mood and every occasion, decks for studying, for meditation, for magick and ritual, for self-readings and reading for others, for dream work, for ancestor work, for art appreciation, and so on. Having a tarot collection is like having a book collection; there are endless ways of telling a story.