You might just get into the Guiness book of world records...People collect all kinds of things; rocks, sea shells, old bottles, bottle openers. Nothing wrong with your collar collection.
I am at the other extreme. I have an old collar that Lyric used as a pup and some old harness for the Chihuahuas. When they got too ratty or too small, I bought new ones. Lyric has used the same leather collar and leash for a couple of years. I haven't had to get a new one yet. And the Chi's hardly ever use their harness so they still look like new.
Anyhow, your collection hobby is definitely quite impressive.