PS3: selling below cost while Xboxes make money?

An interesting piece from, via UK Resistance:

Sony (SNE) will lose $241.35 on every PlayStation 3 game console it sells at $599, and $306.85 on every console it sells with a smaller hard drive at $499, according to an analysis of the component costs conducted by iSuppli, a research firm…. but this time around, Microsoft will make $75.70 on every Xbox 360 it sells… so while Microsoft won’t need to sell a set number of games to cover its build costs, Sony will need to sell five to seven.