Superb idea, and would rid us of the sense of disappointment you're bound to feel today when you're only offered 25% back for your club, even though it may be virtually unused (pun intended).
(For example, I threw away the Z Pro TaylorMade 54° wedge almost immediately after I bought it, and it's too bad I'll only be able to get 25% back for it when they finally release a high-quality short-range wedge, 64° perhaps. I'm currently still playing all my short-range flop shots with the Tour Starters 60° wedge, the last Tour Starters club to remain in my equipment.)