Unless you're designing and manufacturing the CPU's yourself, a custom Cortex implementation would probably cost you quite a bit more than just buying Atom or s

Unless you're designing and manufacturing the CPU's yourself, a custom Cortex implementation would probably cost you quite a bit more than just buying Atom or someone else's Cortex implementation would. You'd have to pay for the custom design, fabrication, and validation yourself, but if you buy someone else's chip whether its Atom, Bobcat, or a Cortex, you'd be sharing the manufacturing, design, and validation costs with all of their customers.