So the whole marketing for Vega could go something like this.
If you buy into our tech you will be cheaper for an overall system. With Ryzen, Free sync Monitor and Vega all in one this should in theory work out true for a like for like gaming system v Nvidia/Intel. Makes sense with all these side by side tests and Raja saying you could build a 4k system for $1000. It's about the only way they can push Vega out more expensive. Those who bought Free sync monitors already saved there.
It's not ideal at all but it could help to get a few sales. G-Sync on its own will force people over to Free sync which in turn would make an Amd card the ideal choice. Just the other day my mate wanted a 4k monitor. I showed him the cheapest 2 on here. The difference was over £400 I believe.
Not a good idea IMO to include ryzen vs intel as nothing stops that nvidia buyer going that way either as a full build.
Vega has to be worthwhile on its on merits as i'd bet the majority of its buyers dont also want to pick up a monitor at the same time.