Both hubby and I feel pretty much the same way about our guns, with one exception for each of us, and those are revolvers which are almost never used but we keep them "for sentimental reasons." So I guess not all of our small collection of guns are tools after all.
Unless you really know what you are doing, buying firearms for investments seems to me a very good way of tying up money that could earn a little in a CD from an insured bank. I've seen too many people think they were buying investments and then, way too late, they or their heirs found out that a gun (or anything else) is worth exactly what a willing buyer will pay for it at a certain moment in time.....usually not close to what was paid for it originally. But I think the same "unless you really know what you are doing" applies to most investments. My opinion.