So 77% of 17 million XB360 owners is 13 million Gold Live! subscribers. And in only 10 million Live! subscriptions! Something don't add up there...
Best situation, about half of the XB360 owners are Gold subscribers, at least if those subscribers ignores multiple account holders per XB360. 10 million members is not the same as ten million unique consoles, which is a more noteworthy landmark which I expect they'd use as a measure rather than members. So it's probably 10 million accounts with some being shared between multiple boxes (can anyone get details on this?), of which a large percentage are Gold subscribers. If that's say 75%, you'd be looking at about half the total XB360 install base as being Gold members. Still, that's a noteworthy improvement on online gamers from last gen and shows at least the early market is quite favourably inclined to online services, and if we assume those Gold subscribers are paying in order to game online, shows a significant increase in online gaming such that it's no longer a smallish niche.