Some people get "funny ideas" when they have something for sale such as stripping an item to it's component parts and then selling the bits separately. If you want the complete item, obviously, you then have to purchase all the component parts which is rather difficult if someone else decides to buy some of the bits. Another "pet hate" of mine is when someone has something for sale, that you want to buy, but then they refuse to give any indication of how much they want for the item or only say "Open to offers".