Dr. Awkward said:
What do you mean? You release a book as though it were the core book of the setting (a la Forgotten Realms Campaign Setting), and then if it sells well enough, you release a second book, etc. I know that WotC doesn't want to fragment the fan base, but I think of it this way: you're already fragmenting the fan base with books like Tome of Magic, or Tome of Battle, which not everyone wants to include in their campaigns. However, with something like a Greyhawk book, it works in the other direction. Those who want to play in Greyhawk buy the Greyhawk book(s), and then they can use all the splatbooks in that campaign. Or in the Planescape campaign. You only really run into trouble with campaigns like Oriental Adventures, Ravenloft, Dark Sun, etc., in which there are specific restrictions on which sorts of things can be imported into the campaign from the various splatbooks. The reason why Forgotten Realms is such a great setting to support is precisely due to its "--and the kitchen sink" attitude toward new material. It has its own unique stuff, but you can plug the Complete series right in without a hiccup.
Still, a single Dark Sun book would probably go a long way toward satisfying people. And I do think your question is nonsense. Even if a single book doesn't satisfy the fans of the setting, they'll buy it. They'll buy it and then complain that there aren't more books in the works. From a business perspective, you never want to satisfy anyone. You want them to buy everything and then beg for more.
