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All eBay Trading Assistants are consignment sellers, but not all consignment sellers are Trading Assistants. That is, you don’t have to be an official TA to consignment sell on eBay. Nothing in eBay’s rules and regulations prohibits a regular member from reselling merchandise for other people. In fact, if you’re just testing the waters, there’s no real reason to bother with joining the TA program. Test the waters with a few “unofficial” consignment auctions before you decide to launch your own boat.
Once you decide to become a full-blown consignment seller, there’s no reason not to join the TA program. It doesn’t cost you anything, and you get the benefit of being listed in eBay’s Trading Assistants Directory—which is how many users find TAs to sell their items for them.