i don't invest so much as i flip. i flip fodder, pretty g1s, and new gene/breed releases. buy low, sell high. usually a waiting game, especially if i'm shoving dragons in my den to wait until fodder floor rises or waiting on the g1s to sell, but the investment is more than worth it. i can buy 100 pretty g1s and make back the cost with a single sale since i'm willing to wait and relist for ages.

you could pick any item or dragon market to watch, honestly. old dragons, specific rare but desirable color/gene combos, new coli familiars, retired apparel, rare baldwin/swipp materials...