Wait. If it is a pressure system, does that mean they are using a bicarbonate & citric acid mix instead of the yeast & sugar method?That not the same thing - the system in the OP is a pressure system - the cost comes from the pressure capable stainless steel container - though you could do it a lot cheaper using a stainless steel brewing keg that can also handle a lot more pressure and has a built in PRV.
Wait. If it is a pressure system, does that mean they are using a bicarbonate & citric acid mix instead of the yeast & sugar method?