I've built up a collection by bargain hunting - keep looking and you'll come up with guns that are worth substantially more than you'll pay. Or buy quantities and sell off the culls. And I tend to keep guns I enjoy shooting and hunting with. Most all are field guns that wont depreciate much from use, but I've bought high grade when they met the bargain criteria, then usually sold them at a quick profit to fund other additions.
But buying high grade guns as an investment without really working at it is a loser. You'll pay a premium on guns that just ordinary environmental conditions will cause to depreciate, and if you actually use them they'll depreciate faster.
It's similar to coin collecting in a lot of aspects. Devote yourself to it as a hobby and you can do well. Treat it like buying mutual fund shares and the front end costs and chances of loss make it a bad investment.
