I highly doubt most people actually know the specs of anything they buy until after they buy it. Even for computers themselves. Sure, there are a lot of people who research it, but don't you ever think that maybe they are the smaller percentage of the people who buy these things?
I think the whole ignorance to specs is much more prevalent to consoles, and releasing specs may just cause more problems than it fixes (when there were some specs revealed, or rumored specs, shit hit the fan hard).
I doubt that most people would even know what the specs mean, so what's the point? I'm not buying the Wii U for the specs. The specs aren't what's making me buy it. I only care about the specs because it's interesting to know, that's all.