I don't think that's the best way of looking at it since the black C has been the primary C for the previous 15 years, and majority of fans are going to purchase the jersey they wear most nights. If it were vice versa, and retros have been the primaries, most fans would be wearing those, over the alternatives.
Plus some fans are wearing the 04 jersey rather than the current iteration because they jerseys are similar enough, that they don't want the new one, or prefer the original set.
I think with the point you're trying to make, the sales of the retros would give a impression on the general fanbase perception on them. I don't have numbers, but they do continue to bring it back continually. So I think the organisation is aware that those jerseys are viewed fondly.
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