Again, it all depends on what you want from a gun. If it's just a tool, then you likely don't have many- 2 or so SD handguns, a couple hunting rifles. I just can't imagine anyone wanting a safe full of Glocks and Shields. Makes little sense to split up your practice, when you can focus on just a couple and become very good at those.

If you have, say, 10 or so, you're then most likely 'collecting', and the odds are that a lot have unique things about them.
My group could be something from a museum or a book, not so much a current Cabela's sales page.