How do you fleece people? Simple, build complicated components that can't be replicated or repaired and then charge through the nose for them. Sinclair C5 pod?
No... Citroen Xantia suspension.
My beloved Xantia failed it's mot on a leaking hydrolastic suspension pump. No sane engineer will touch them. Citroen said merrily "Of course we stock them! £600!".
But then I called a local guy who suggested "Well, have you tried replacing the seal?" ... No, because Citroen don't sell them. "Actually, they do, they just don't tell you. Ask for this part number..."
75p later, £5 and a tea to fit, and it flew through the test
Gotta love those dealers...