> Basically, all vendors tack on the nvidia card once you get into high end
Yup. By adding a Nvidia card (or, far less commonly, an ATI/AMD one) they can sell that laptop as a specialty "Gaming" machine - and with margins on commodity hardware being so razor-thin these days, that's exactly what shrewd marketers need!
Yup. By adding a Nvidia card (or, far less commonly, an ATI/AMD one) they can sell that laptop as a specialty "Gaming" machine - and with margins on commodity hardware being so razor-thin these days, that's exactly what shrewd marketers need!