At the least, they keep up with inflation. If you buy quality guns and maintain them I don't think you will lose. Sometimes you hit a home run.

In 1968 I bought a "K38" from a frat bro for $85. Later I noticed it was an N-frame. Turns out it is a 1951 vintage 38/44 Outdoorsman. Now talk about a good investment; but back then a 38/44 would not have cost more used than the K38, cause .357s were the rage. Buy what you like and sometimes you make out. One key is how long you hold onto the items.

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Revolver luvin' Mountaineer