While it seems to be a totally unfair what you get back selling it back here, it is quite comparable to real golf. If I bought last years TM R11 for $400, and wanted to sell it back to buy the TM R11s, If I got $100 (25%), I would be psyched to get that much. Real world retailers rarely give that much for used clubs. Reason being they are selling it back to another customer and need to make a profit on the sale.
I understand the frustrations of what we get back here, especially since there is not a used clubs for sale section in the pro shop. Although this could be done. Buy the used R11 driver for 800 creds, only the specs would be slightly less than the real thing. And there wouldn't be unlimited quantities, only what was sold back.
Sorry, got off topic there. I was just trying to point out that unfortunately it is comparable to real golf. And the older the club is (meaning year it came out), the less you'll get for it.