A Close Shave

New razors have that "lubricating strip" that gives you a nice, close shave for two days before it rubs off, leaving the white strip that means "better get a new razor!" Funny how the company that makes the product also tries to artificially determine how often you need to replace it. Anyway, what I wonder is this: If this lubrication is so great, why don't they put that in a can and sell it separately?