JoeGKushner said:
How much of D&D's sales are because it's "official" D&D?
It also further muddies the waters if we consider that, if you drop the brand, you increase the likeliness that a) the product won't be carried by major retailers, and 2) even people who might be interested may never notice it due to lack of brand recognition.
I mean, if your point is that D&D product is selling solely because it's got the brand, there may be some truth in that. However, as we saw with 2e, unappealing product does not sell, regardless of how many collector fanboys there are.
I think a key thing to remember is that WotC is probably one of the few (and likely the only) RPG publishers that can afford to do actual market research. 3e was also play-tested longer and by more people than probably any RPG release in history. Not to mention, it gets discussed in public fora by more people, more often, than any other RPG in existence, by a WIDE margin. If there were a majority of the fanbase wanting the game to be anything other than it is, you can bet the farm that WotC would listen and change their product line accordingly.
Thankfully, a number of small publishers have listened to the minority, which, given the size of the D&D fanbase, just happens to be enough people to make it profitable to market a game that suits their needs. C&C is probably proof enough that, while not a majority, the people looking for a simpler game that still provides a D&D-like experience is large enough to warrant courting.