MsN sick

Was really tired with work these few days..It really works to make me sleep 2 hours earlier. I've always been logging to msn..i realised that almost all of them are on msn but most of them won't have a chat with you..I was wondering why? Why people log in to msn but leave it away or so on? What's the point duh. I have to admit that I actually did that too when i'm working but not at home though..I take on msn to chat with friends but most of them either not replying or they are on but it's like they don't even bother about msn..what for you log in to msn? lol..damn