Probably quite true that they don't spend 26% of the money on games. But that's EXACTLY the point. As a group, they've probably got the same (potentially more) disposable income than, say, the power gamer group. Perhaps it's a stereotype, but I suspect the power gamer group is somewhat underemployed.
The point of the 'Dormant' segment is that they don't spend on games. It raises the question (a question of interest to game developers) ... what does it take to get this group (and their money) back into the game.
I'm a 'Dormant' gamer (formerly, heavy into multiple MMORPG's, a few FPS). I'm not any more. Just as the description of 'Dormant' gamer implies ... I'd like to play with family (well, not so much) and friends (definitely), but I don't have the time. I like deep complex games (many MMORPG's fall into this category, I think). I've got the disposable income. I've even got the desire to game ... I'm just waiting for a game that fits my needs.
Now that my afflication has been labelled, when is someone going to come up with the treatment (a game for me).