Wow $50 for NYLON bands... it probably costs them less than a dollar to make.
I know apple likes a nice profit but $30 at the highest would have been more enticing and people would buy more than one color.
My wife has a 38mm Series 0 and uses the longer band option with the original silicone band. It wasn't obvious when we bought the watch that the silicone is the only type of band she'll be able to use as they don't put the long option in with any of the other styles of band. This really is penny pinching, especially when, as you say they are charging £/$50 for a bit of nylon webbing!!