Consumer loyalty is not a good reason to buy a console, I agree. When I rented the N64 and the PS1 before making a choice, I was totally thinking about buying the 64. But after playing both, I totally changed my mind. Although that consumer loyalty isn't the best criteria to buy a next-gen console, that doesn't mean it doesn't happen.
Blu-ray holds 25GB per layer, HD-DVD holds 15.
http://www.somacon.com/p116.php
You also keep saying stuff is "too expensive" when you don't list the final, official price :/