Morally, I think it's very wrong when EBay sellers buy small spares (ie hair, or juice cartons, or whatever) from DS and advertise them on EBay with a starting price of ten times what they paid.
But, business is business - everyone is trying to make a living out of something, and I'm just very grateful that I knew about DS from the outset - there are plenty of people out there wanting to replace the bits of their children's Playmobil that got hoovered up who innocently think that EBay is the place to be buying such items.