It's actually not all that expensive. You pay a lot up front, but you are getting 200g of soap, which is twice as much as a typical soap puck. On top of that, you need very little soap for a three pass shave, so that 200g goes even further. So think of it more like buying soap in bulk than paying a premium.
I have to believe that spending even half that amount on Williams or Arko would last far longer.