LYN's Moderator often encourage C.O.D but sometimes it is not fair to seller.
Often got calls from buyer and after some negotiations they agreed on the deal and ask me to place an order for the item. When the item arrive and ready for C.O.D they can tell you they no longer need it. Does not happen once but alot of times. I tried to apply C.O.D but seems unfair. Do you think 50% in advance will be better.