Car parts in general are getting more expensive but you have to consider the car you're driving.
I would rather pay $200 for a part that I knew was of good/OEM quality rather than $50 for something cheaply made and inferior to OEM parts.
And the cheap Chinese/Asian made stuff can be real rubbish. To be fair not all stuff made in China and Asia is though. For instance their machine tools can be very good quality.
Recently I was given a clutch slave cylinder for my VW. The guy that gave it to me sold his car and was clearing out his spare parts.
The reason he "gave" it to me was that this Chinese made slave cylinder was made of cast aluminium not cast iron like the original.
When I saw what it was actually made of I couldn't believe it... It's sitting on a shelf in my garage gathering dust
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OK... So what's the real reason? It's all about supply and demand. Basic economics.
An item $ value is determined by it's worth to a customer.
Porsche owners are generally better off than the average Joe so they can afford to pay more for their parts.
Making anything in Germany is expensive so naturally that's part of it also.