Anyone who allows an advertisement to COVER their content on a site instantly fails as a web designer. I could think of about a thousand sites that do this, all of which completely lose my respect. I, among many other people will NOT copy the text to something else to read it, reload your page, or click your ad. You are all losing potential return visitors by making the sole reason people visit your site not functional. Way to go, enjoy your quick advertising cash while it lasts. Your site is on a fast path to worthlessness you dirty  Sellouts!