I think that may somehow counteract the desired outcome. I know, amongst my friends, gaming is a serious detractor and obstacle to personal development. I’d be afraid that all the WoW/Bioshock/D&D/etc. references would just make the reader want to drop the reading material and get back to gaming. I agree with you in the feeling that the examples used to illustrate principles, practices, and results could benefit by being ones to which more people can relate, but I also think that focusing on the gaming community is just as (if not more) exclusive as the tiresome number of sports analogies. You could always write a specialized version with gamers as your target audience. :) I can definitely see some excellent parallels being drawn, and the geekier, the better. Think about how excited you get about your interests, and then apply that to the appropriate scenario. We could totally geek out if it were done well.