Gillette Mach 57

In 1901 King Camp Gillette invented the safety razor. He hit upon the idea of selling the razor at a loss, and making money on the replacement blades, something printer manufacturers and many other companies do today. Gillette have now got the Mach 4 - and soon to be released Mach 5. Where will it end? How many blades do we need to shave? I'm off now to wax my chin....