Haha! Interesting question. I don't collect them but seems to always acquire and I don't really want a holster for every pistol I own either. I've switched more to universal type of holsters rather than gun specific so the numbers don't grow any more.
I currently have 4, a random leg holster and serpa 2 with various attachments for a beretta 9mm from my service days (will one day buy a personal and can use it again) a serpa 2 for my 1911, and a "fob bra" leather shoulder holster
I have 2 that I actually use regularly. But, I do have a cheapo....Uncle Mike's type....for every pistol that use for storage or transportation purposes to the range. So..technically I have 9.
I like shoulder holsters and have three. There' a storage box full of other styles including a sneaky ankle holster. One of our members sold me a bunch of holsters and they are very nice.....Thanks!