These are manufactured by us so they are made from high quality, robust plastic. If they were made in quantities of 1000's in China, the price would be less, but unfortunately the Classic Amiga market is not large enough to justify such as production run.
In that case, why not add a switch (if needed) to spread support to Atari products as well as the Sega Master system? If this thing handles as nice as it looks, then I'm sure there would be plenty classic gamers out there with a 9-pin port just itching to have one of these plugged into it!