I clicked on an abt.com PPC (pay per click) ad and this message caught my attention—
Notice the Purchasing from an unauthorized seller may invalidate your warranty text.
This is a very effective message for a PPC landing page. Why? Because the #1 objective of a PPC landing page is to prevent shoppers from hitting ‘back’ button (and reviewing competing ads). And that’s what abt.com’s warning message accomplishes.