There is no Free Live day with Silver. Geeze.
Xboxlive silver = Gamertags etc bla bla bla, can play mmo games but with the developer fee bla bla bla
Xboxlive silver = All of silvers features along with online play, can play mmo games but with the developer fee bla bla bla
They can't just let all of the Xbox360 owners be able to log on to XboxLive. If there are 50 million XboxLiveGold subscribers out of 900 million Xbox360 owners, then MS will be ready to support 50million people on live.
To let every Xbox360 owner be able to log on to Xbox Live (everyone who owns an Xbox360 has XboxliveSilver), then MS is going to have to miraculously build an XBL server ready to yeild 900 Million people on Xbox live at once. Im not saying that all of the xbox360 owners will log on (900), but that's not the point. MS won't be able to support 80 times the normal max amount of people on their servers.