The Toyota 2F is an out of production engine that fulfills a niche market, it costs 3x as much to rebuild one as a new Toyota engine. The parts don’t cost much more and there are fewer of them. They cost more to rebuild because that is the going rate. Should the shops doing 2F rebuilds charge less? As others have pointed out in this thread, car engines are not well suited for air use, so the market will remain small and made up of people willing and able to pay 30k.
+ if the Toyota engine fails in a car you tow it to a shop -- if the 172 engine fails you emergency land in the best case (or crash in the worst). There is just a whole lot more onus to work on plane engines and that should and does come with a price tag...
