I have way too many. If I can’t sub then I don’t mix. Once you get up to the number of flavors we have too many flavors just get ignored. I look over my lists and see flavors I haven’t mixed with in forever or not at all. I need to start using the “forgotten “ stuff or piff it.
You want to try a new recipe so you get 5 versions of Pixie Fruit, one works so you have 4 bottles sitting there that will never get opened again. You don't want to get rid of them in case you need them one day. Multiply that by 50 and you got a mess.
I went down that road for a while. My solution now is I have a rack where I keep my flavors. There's room for around 10 big bottles and 30 one ounce bottles, when it gets crowded enough that it's hard to find stuff when I'm mixing I do a purge. Gets me in trouble sometimes. I stopped using Earl Grey for a while once, decided to go back to it and discovered I had purged a couple of full one ounce bottles.
I know some folks who are more adventurous mixers need more flavors.