It's very likely that at least at launch they weren't making much if any profit on the 64gig model, instead looking to sales on the steam store later on as a so

It's very likely that at least at launch they weren't making much if any profit on the 64gig model, instead looking to sales on the steam store later on as a sort of loss leader. You're really underestimating the amount of hardware they packed into a comparatively small space for 400 bucks.