These days, it's different: many games are marketed under the illusion of being single-player, when their focus has shifted to an almost mandatory multiplayer mode.
They may not care, because the on-going gouging for multi-player is probably quite lucrative.
But I will not play any form of on-line or multi-player game, unless it all happens in the same room. I want to be able to pick up a game when I have time to kill, and play for a while ... be that an hour or several hours.
Multi-player games have no appeal to me whatsoever, and my XBox 360 hasn't been connected to a network in a very long time and won't ever be again. The first time I saw ads in the games was the last time the XBox saw the network, because I realized that on-line gaming was to give them even more money.
When microsoft said the XBone needed to always be connected to the internet they lost a potential customer. No way I'll own it now. And, at this point, I've lost track if that's even the case or not, Microsoft has flip-flopped so many times.
Give me a title like Skyrim, or Portal, or even a Tiger Woods golf game. But when the day comes there are no console games which I can play entirely offline, I will no longer own a console. It's as simple as that.
I'm old, I'm slow, and I lack the mad skills to play against other people. That pretty much sucks all the fun out of a video game for me, and I'm not paying extra for the privilege of getting my ass handed to me by a smarmy 10 year old.
They may not be as aware of people who play offline games, and the people who do may not generate the on-going revenue. But I'm betting there's a lot of people who don't play on-line games, and they have no way of knowing just how much those get played.
So, for the gaming companies ... ignore the offline, single player market at your peril.