If selling on ebay I find selling books as Buy it Now with an offer. Be honest on non graded books and add a lot of photos. Than let the book sit, don't look for the quick sale. Be kind on silly offers even though you want to be snarky. I prefer to sell CGC graded books because I don't have to take returns on third party graded books. And don't be greedy, all books are not high value. If you want to sell think about the client, they have to cover sales tax on top of your cost. Remember to cover ebay fees and PayPal fees. Just some of my thoughts.