For the sake of argument let's say that a blade maker announces an enormous breakthrough in blade technology and introduces into the market a blade made from some super duper hardened & unbreakable ceramic or polymer that gives a verifiable 365 multi-pass shaves. The reviewers all rate it as the best blade they have ever used and it's quality and durability are not in question plus it works in all razors perfectly as well. Would you shelve your current blade choice(s) and pay say £50/$67.50 US for one blade? Remember, the quality has been verified and there is no doubt that it will provide you with one year's worth of perfect shaves. The only question is how much would you pay for it?