Katy has sold clothing on Mercari and Poshmark for 2 years and does most of her thrift buying online from eBay, Posh, and Mercari. Reselling clothing online can be a great income source or a even full-time job. However, the platform a seller chooses has a huge impact on their success. This is true for both a full-fledged resale business and for anyone trying to clear make more money on ebay or poshmark their closet. Both eBay and Poshmark are huge marketplaces for selling used or new clothing online. But which one is better? To help you decide, moey examine these factors:. The fees that a platform charges cut mony sellers’ profits.