I’ve bought and sold one privately and bought two from the club mid way through a five year cycle. In all cases, the lifetime one has transferred hands @£1k plus VAT, and the 5 year one at £500 + VAT, pro rata to the period left. ie no profit or loss.
However, I’ve heard that others have transferred for less and more...
Edit: thinking about it, singles are harder to shift than pairs, and this has been reflected in the prices achieved by others...