and all we know for sure is that Microsoft wont give the exact figure of its members who have Gold Subscription.
I really don't think that matters to them in the larger scheme of things.
As long as some gamers feel it's reasonable to pay for their online gaming (which helps subsidize the other services and software and servers etc) then the larger picture is the D/L content that anyone can just log on and get at any time. there is no "active vs. non-active" wrt Silver (free) membership. Once they activate the online portion, they (and their families) are prospective customers for the hundreds/thousands of pieces of micro-transaction material available (as well as having free access to the other online features).