The only reason I decided to get Facebook was to stop the constant emails from various people basically saying 'GET FACEBOOK 'CAUSE IT'S AWESOME' (though I generally beg to differ for a variety of reasons).
With it's constant changing around of the homepage to see how many people they can annoy on a weekly basis, I really hate it, though I use it mostly for some of the applications which shamefully amuse me.
There isn't a hope in hell I would pay to use it, especially considering there are no people on there who are too important for me not to talk to on msn, the phone, or in person.