the math is pretty easy...dropping another $10-$15 billion to get the mobile group to break even makes no sense for anybody but the employees of Intel...
Imagine being a VC and someone is standing in front of you asking for you to invest $15 billion in their business and if all goes well (and I mean really well)..he'll deliver you a break even business at the end of it...he'd leave your office on the end of your foot..right??