I'm not trying to justify or validate this behavior, but in my own experience you basically want the ability to buy the item, but may change your mind. So you s

I'm not trying to justify or validate this behavior, but in my own experience you basically want the ability to buy the item, but may change your mind. So you string a buyer along while you make up your mind. (personally, I've found myself doing this and then having to stop because the seller isn't some big mega corp, but just some random other working class friend)