Blu-Ray Wins Among Otaku

[http://www.otakunovideo.net/wp-content/uploads/2010/06/eva_2_22_packshot-209x300.png|209x300px|Evangelion 2.22 on Blu-Ray]

I noticed an interesting trend in the top-selling DVDs and Blu-Ray discs in Japan for the first half of 2010:

Among DVDs, the top-selling anime were #3, #17, and #33 overall. Among Blu-Ray, the top-selling anime were at #1, #4, and #5. Way higher overall than the DVD sales.

It seems that otaku are driving Blu-Ray sales in Japan.

On the one hand, this makes sense -- otaku are techies, after all, so they're naturally hungrier for cutting-edge quality than the average consumer. They're also more likely to own Blu-Ray players as a result.

On the other hand, we are talking about 2D animation, which typically doesn't benefit from super-high quality as much as, say, live-action film. Flat, uniform cel colors just don't look fantastically better at higher resolutions, compared to the many subtle hues and tones of a live-action shot.

Are Japanese otaku blindly obsessed with high quality, even when it doesn't really matter? Or is something else at work? Do the Blu-Ray releases come with special features that aren't included with the DVD releases? What's going on here?