It's really not, especially if you look at their current model for doing so. Netflix at the moment are breaking into mobile gaming, which means the bandwidth requirements are placed on Apple/Google's app store infrastructure. I'd be surprised if Netflix don't have any sort of metrics gathering infrastructure to judge how much people are playing those games, but they're also likely reusing the same infrastructure used by Netflix video streaming for that, so the incremental increase in load may well be negligible.

I was referring to their plans for a game streaming service.