Why does eBay let people that don't complete transactions remain as members? To whose benefit ?

Ever wondered why eBay lets these members stay on line? Because, eventually, eBay make money off them, that's why. They don't give a care for honest sellers, and could care less if you and I get shafted. Then, try and get any of your money back off them once they've taken it. They'll bar you in a second, but the member that caused your difficulties will get away scot-free.