This list contains more than 150 E-commerce marketplaces https://www.webretailer.com/b/online-marketplaces but it does not contain all E-commerce marketplaces by far. Many useful local and nice E-commerce marketplaces were not included. Remains THE question: Which E-commerce marketplace is the most seller-friendly? The answer depends of what you expect from an E-commerce marketplace of course. Conditions and requirements: - E-commerce marketplaces that charge a commssion on sales are OK but never pay for a subscription to just list your products. - Bulk Listing by CSV / TSV (At least > 10, 000 products but unlimited products are better) - Product line: out-of-print, used books and rare, valuable books and collectibles. - Auditory: N. America and Europe - Payment methods: Not only Paypal, an E-commerce marketplace must also have other payment methods available. - Direct Buyer > Seller payments only (some useless E-commerce marketplace such as Fruugo collect payments themselves and only after a few months pay (sometimes) sellers)
I think it depends on the niche that your e-shop is operating in. There are many large general topic marketplaces, yes of course, but there are also many special interest marketplaces out there.