I think there’s very few people who have an actual need for that much storage but want to buy a used phone. Buying a used phone is primarily for financial reasons (so this is an extra filter compared to the market for new phones), and when you want to save money you’ll also be reluctant to spend extra on more storage. On the seller side, I can imagine that people with buyer’s remorse tend to realize they don’t actually need that much storage (even when that’s not the primary reason for the resale). So there’s a bias that defavors the higher storage tiers (even more) on the used market.But I'd think that works in reverse. There would be a ton of 256gb models on the market, and very few 512 or 1T models, thus upping the value of the higher storage models.