it will just be the number of posts that is removed. actual post content will stay (until it gets pruned naturally).
you could have 1 post and still access MM if you previously met the post count :]
provided I get my unsold posts back, don't like the idea of them floating around in cyberpsace, then I'm donating all of my posts (1,300).
They don't get 'sold' individually. They get pooled and redistributed in up to three lumps, for top, 2nd and 3rd highest bidder