One more?...that depends on how your interests develop. We all think of hunting various things, but what to do when you get into long range shooting--in different weight classes, or even Benchrest .22--you can end up with multiple guns for that discipline alone, let alone all the 22 ammo stockpiles for what shoots best in each one, as well as truly stocking up on premium rimfire when you DO find the brands that work best and want an indefinite supply in those same/consecutively numbered lots of ammo...
What about Cowboy, or 3-gun, or sporting clays, trap--endless, and all depending on activity specific firearms of better quality, that fit or are bespoke. Don't even get started on collector guns, or those highly engraved, or with provenance, historical representative pieces.
What about loaner guns for friends and family, guns for all the kids as they grow into it. Or cut down stocks for wives/GF. What about grandpa's old guns and other inheritances? What about guns that wear out or otherwise need to be replaced? Where can it all possibly end is the larger question. A better question might be "how many more will fit in the current safe/safes?"