You know, it occurs to me that I never really answered the question in the topic, even though everyone basically knows how I feel about it. So I won't buy a book because it has racial diversity. But I might *not* buy a book I might have been interested in if it lacks any sort of diversity. It does depend on what it is. I read the Angus Thongs books even though the characters are all white... probably, I don't think they're actually described physically in any real detail.
If I felt that there was a conscious effort to exclude non-whites from a product, I wouldn't buy it. And I would probably regard it in much the same way I regard Heroes Now!
It's kind of like Star Trek. Gene Roddenberry created it to push a specific political agenda with regards to race. Dr. King himself saw the importance of simply having a black woman in the cast of the show. Uhura wasn't the star, but just being there made a difference. It makes a difference that people of different races are just there, just doing what everyone else is doing. It may not matter to everyone what colour the little hobbits are in the PHB, but it probably matters to SOMEONE.
As for my earlier hand waving joke... well... I don't want to be accused of making a straw man argument, so I'll say something substantive. I think wanting to exclude images of non-whites from any sort of popular media is racist, flat out. And I think no matter what the justification given is, it's unacceptable. I think a conscious desire to exclude blacks is racist by the very definition of the word.
And since everyone else seems to want to point out their race in this topic, I think I should point out that all my opinions are coloured by being one of the whitest people in the world. Like Conan O'Brien and Dennis Leary shades of white.