Anyway, if people are talking about "gun rooms" now, I know 10 people with one, we are starting to talk about more what sounds like what are collections not mere "bearing arms."
You are obviously not a hunter. If one hunts, there is a wide array of guns necessary for the task.
Deer are usually found in the bottoms, in brushy country - A terrain dependent weapon might be anything from a shotgun to a carbine, to a 308 or 30.06 . All are required in possession.
But none of those are necessarily good for mtn goat or sheep, which are usually a long shot, or likewise antelope. Those guns are more game specific. A 300win would not be a good choice for antelope, but good for a sheep or a long shot on an elk. Antelope are usually a long shot, but you'll want a little caliber, because the critter is smallish, and a big bullet will wreck the meat if you happen upon a short shot.
Elk, moose, and bear, you'll want a whole lot of knock down power - but again, that depends upon terrain. A big bore carbine for brush or deep woods, or a big bore with a scope for open area.
Right there is an array of 5-10 'high powered' rifles, depending upon your financial ability, and I really haven't addressed shotguns and differences in ducks, geese and upland bird hunting. Nor have I addressed hand guns and protection either. Shoot, my pickup has at least a carbine and two pistols that live there...
Add to that memorabilia guns - that one your daddy bought you that killed your first deer, which you'll never part with... that old .22 you went plinking gophers with when you were but a lad... Your dad's collection which you inherited when he died and will pass down to your boys...
It's dang easy to get a bunch of guns hanging round. Most guys I know would have more if they could afford to.
Anyway, it would have been fine if this fellow had been popped and buying 3 high powered rifles a month in a state like Nevada should have been a tip off.
It would not be uncommon, back in my day, for me to walk away from a gun show with three to five purchases, probably a mix of handguns and rifles. For me to buy three 'high powered' rifles in a day is not even worth mention.
As
@Smokin Joe made mention, guns hold value remarkably, and work very well as trade stock. Would those guns I bought hit my private collection? Maybe, but probably not. Most of them went away as trade.
I still have a matched pair of nickel 9's in shoulder holsters that I traded into... That are just to pretty to part with... I tell myself they are for when I get dressed up... They'd be classy with a suit...
But I don't own a suit, and little pop guns like those ain't good for much else.