Bear in mind places like ToTW will have your item at their location, do the photography, advertising, and handle the shipping ... along with the infrequent buyer who rejects the item as "not as advertised," or wants a refund of part of the selling price, or the item is damaged in transit
So balance your hassle cost of packing, going to FedEx or UPS, and handling complaints.
CLA has a wonderful website and hosts many fine crafters, so you just need to determine your personal time spent.
(FWIW, in 2001 as an experiment, we sent a packge containing only 2ea 12"x12" 1/2" thick plywood squares, double wrapped in brown paper, the outerwrap marked "Fragile" and "Do Not Bend," from NYC to LA via registered mail. It arrived in LA broken in half with the outer wrapping intact. USPS has greatly improved since then, but they, or any of the carriers, are not perfect.)