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I've been riding sport bikes for 30 years and clutch fluid gets dark on them too, but its from heat, not from dust contamination. I have never changed the fluids on the bikes other than the normal maintenance intervals. I have friends who constantly change theirs as soon as they see it starting to darken. Never had any issues on my bikes with the clutch sticking. I've had Ducati's, KTM's, Aprilias, Honda's and Yamaha's and never had an issue.
From everyone I've talked to and the research I've done, it turns dark from moisture absorption (although this takes a long time) but with the clutch its the more frequent actuation and heat that makes it go dark so quickly. If it was clutch dust you would also be leaking fluid.
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