If your seeing MSN a lot, they are on IE and haven't even installed FireFox. Or like my installed FF and never customized IE but perhaps left IE as the default system browser.But in the real world people rarely if ever 'customize' their machines or browsers.
If I had a dollar for every old laptop that still defaulted to the OEMs MSN/support page on the browser I'd have quite a lot of dollars.
Once again the reality disconnect of tech developers and real world users.
Most users don't even notice when annoying toolbars appear let alone customize and remove them.