Black, you're missing the point completely! There can be several reasons one wouldn't want to have a billion conversations on msn, for example they feel down, they watch tv while being online, play an online game or doing something else that requires time (for instance, I often play my guitar while being online, and that's pretty much impossible if you have 3+ convos going, so I might use the "busy" or "away" sign on).
People can have their reasons for not replying or having the offline sign on, and you just need to respect that.
If you need to talk to people so badly, then call them on their cell phone, but I am pretty sure you'll soon realise that people get annoyed if someone phones them every other day, and suddenly they might just stop answering the phone - pretty much the same as on msn.
Well, in your world that would just mean they should throw out their phone if they want their privacy:
you want your privacy dont have an msn,dont go online,dont live in cities go live at the mountains..
Best line ever, but I am afraid it is simply not the way the world spins.
Cut people some slack, I am sure you're simply overreacting on this matter - they have their reasons, and quite frankly, it's not really any of your business what their reasons are.
Besides, I think it is WAY more polite to change your status than to say "I don't wish to chat with you". That's nowhere near polite in my opinion.