I really want to sell a guitar of mine on eBay as I think I'll get a much better deal due to the exposure. However, I've never sold anything as large and fragile as a guitar on eBay so I am unfamiliar with the shipping costs of shipping something so large. My biggest concern is someone wanting to return the guitar. It is in excellent condition, yet I've sold things one eBay before in excellent condition only to have a buyer request a refund over something dumb and trivial. Apparently, even if you mark "No Returns" on your listing, a buyer can still demand a refund and if you don't give them one, they'll leave you a negative review on eBay and will go after you on Paypal. Is this true?