Drums can be a good investment, but only if you can buy them at a very low price and are reasonably certain you can get more if you sell them. In other words, the factors have to be in place to go that route.
If you can buy a mint Ludwig Acrolite for $50 at a yard sale, it's a foregone conclusion that you will probably get $200+ when you sell it, as long as it's kept all original and in great shape. That's just one example. The trick is, buy low, and only when you know it's worth more. The vintage and collectible drum market changes. Like vintage guitars, the blue chip collectibles in the drum world are the best bets: Gladstone snares, Slingerland Radio King snares and sets, Leedy and older Ludwig snares, Gretsch 3-ply Round Badge sets, vintage Rogers wood Dynasonic snares, rare vintage wrapped finish drums, celerity-owned drums. etc.
Buying drums at a high price to start with makes no sense at all in terms of investment.