Wondering if adding a new feature to your product or service will really make a difference to sales? Try running Adwords traffic to a split test pitting your ty

Wondering if adding a new feature to your product or service will really make a difference to sales? Try running Adwords traffic to a split test pitting your typical landing page against a variant that highlights the potential new feature. I don't get it. You advertise the feature but don't actually build it? That sounds pretty annoying.