Taking the risk means evaluating uncertainty, but the most important thing is accepting a potential loss. I wouldnt recommend investing in risky plays unless you can take the loss and just move on. Things like company seals are always a safe move , so hoarding hippogryph skins and materials you can quickly turn in for them are 99.9% safe. Assets like furnishings, not so much, because they are so easy to make and dont require HQ, so basically anybody can make them, and the mats are easy to gather. HQ aethersands will be super profitable the entire duration of the expansion, specially even patches, and they will regularly drop in price in even odd patches. Primal materials from annoying boss fights with annoying mechanics are most likely to stay expensive for a long time. Examples of this are sephirot's Fiend Sap and Shynriu's Scale. Sophic Beads are my next bet, considering the popularity if the weapon aestetics, the potential golden or white glow, and how it still cannot be solo'd reducing any potential oversupply in the short future.