Sales seems to be a little hit and miss - those seats would usually go for more but it relies on the right buyer at the right time. Some of that's down to sharing it about as much as possible - eBay is great, but so much of the second hand market seems to be on FB now which I dislike, but you have to embrace really.
One throwaway comment last year saw me shift two sets of standard, cloth, non-Recaro LCR seats for ~£100 each, and on arrival one of the buyers then bought a set of wheels, headlining and some other odds and sods too. Then again, I've actively advertised bits before and had minimal interest. Swings and roundabouts and no point beating yourself up about it, or worrying about squeezing every last quid from a sale - life's too short.
I've currently got a garage overflowing with odds and sods from my old LCR which I broke for parts - I need to get some things sold to
help fund my current engine build and I fancy going standalone - Brembos, wheels, bumper, spare engines, spare gearbox etc all sitting around gathering dust. I need to get on that really!