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Depending upon the application, different designs of hoses were developed. Application includes water,pneumatics,hydraulics,corrosive services in chemical industries,fire hoses and many. Some hose pipe are made from simple rubber or Nylon for water application. Application in corrosive environment requires to be lined with special rubber or wire braided with inside tube covered by a resistant material. For handling acids , you have to use Teflon lined hoses and this is a costly affair. For the same application , with more pressure thickness will go on increasing and so the prise hike. For exotic hose material hose become costlier as the pressure increases. Some hoses requires special processing and best crimping methodes become more costly. Go through the source link.
Maybe they would start an Occupy The Sewer movement. That's where they belong.