£80k sounds like a lot for a seat. Is there fancy stuff inside it?
Not overly fancy. A few electric motors (where fitted), 5 point safety harness, some of the belts with inertia reels. There are numerous adjustments: recline, height, fore-aft, thigh, armrest height, headrest height/angle, etc. Manual backup controls are required for all electric controls.
All aircraft parts are horribly expensive, usually because of the testing requirements and because there is usually a limited production run.