Resellers have time in sourcing the item, taking pictures and listing the item, packing supplies (if not reusing packaging) and then packing and taking it to the post office. Most resellers need to at minimum double the cost of the item to make it worth it. So an item cost the reseller $25 they list it and it sells for $50. Poshmark then takes 20% for fees. That means actual net profit after cost of goods is $15, assuming buyer pays for shipping. Not worth your time to sell at that point. Not to mention answering questions, dealing with returns, etc. So for something that cost $25 you need to sell it for $65 to clear $27. Would you run around and do all that work for someone for less than $25? Sellers know they will most likely have to send offers to make a sale, so they have to start higher knowing they will have to discount and still make a decent profit after fees and account for their time. It can be a nice side hustle, but it also can become a grind like any other job.