My solution to this cosmetic problem is a dab of polyurethane on the light spots. The color doesn't match real well, but it protects the exposed wood. I am sure that if I tried, I could find a better color match.
I have had four wood boards and usually keep them 3-4 years, so I have had these bare spots show up on all the boards, usually after about two years. Not a big deal in my opinion and the newer model boards seem to do better than the older models.
Formula 160; iSonic 111; HiFly Move 105; Tiga 263; '85 Mistral Superlight.
Maui Sails TR 11.0; 9.2; 8.4; 7.6; 6.6; Maui Sails Switch 6.0; 5.2; Maui Sails Global 4.5; 4.0.