Thanks for the comments, Baudouin. I do think the issue is a bit more complex than "Apple or Adobe do not get a penny for devoting software resources to reverse engineer every camera companies new little software puzzles..." The reality is that buyers who opt into either Aperture or Lightroom are taking a gamble that the company they opt into will continue to enhance and update their product. The reality is also that Apple and Adobe are competitors, and pros and serious amateurs are going to be frustrated (that's putting it kindly) when the company they bought into lags severely behind its competitor. That lag drives Apple users into the arms of, in this case, Adobe.
For instance, I have been an Apple user for 20 years or more. I purchased Aperture in its first version, and have upgraded repeatedly. I have a photo library on it now containing 17,000+ images. Because Aperture does not yet support the X10, and I am using it for numerous shootings, I have been forced to buy Lightroom. Not surprisingly, it does a good job converting the Fuji RAW/RAF images. My drawn out point though is that if Apple is going to sell to the professional market, they too have an obligation. As you note, "it's a small potential user base," but that base made a key decision early on and becomes, in effect, highly dependant on Apple to remain competitive. My point in earlier posts is that if Adobe can support new cameras quickly, so can Apple--and my emphasis is that they have an obligation to do so if they want to keep their user base.
I prefer using Aperture. I'm now using LR for current Fuji shots. I don't like Adobe. I prefer Apple. But I've been forced to go elsewhere if I'm to use an extremely popular camera. (Fuji, btw, has sold 10s of thousands of X10s in the last 5 mths.)
And as a correction, they do not charge for the RAW conversion software that accompanies their camera, so that's not why they ignore the DNG standard. I too am frustrated that all manufactuers don't use DNG, but they don't.
Regardless, if Apple is going to sell software for the professional market, they are going to lose some of that "small base" by falling measurably behind Adobe. That's not smart business, and it harms Apple's loyal users.