This isn't really something that's specific to guns. Any hobby is going to end up with statistics like this. If you take a sample of say, motorcyclists - you mi

This isn't really something that's specific to guns. Any hobby is going to end up with statistics like this. If you take a sample of say, motorcyclists - you might find that for 10 people who own exactly one, there's a collector who owns 20 who skews the average strongly (and a few more who own 2-5). Guns are cheaper (on average) than motorcycles, they last longer, have been around longer, and tend to get passed down by generations (so one might find themselves with their grandfather's collection of 20 guns, and then add another 20 over their lifetime, then pass them along to their grandchild), so the skew is going to be much stronger.