Quote Originally Posted by MadManuel View Post
what is the benefit of having a seven day set, over say a single blade?
Used in a rotation you will go 7X longer before you have to break out the hone. Right now I have 3 blades, but I randomly pick one, so my favorite has to be retouched more often. If you have 7 of a razor you like then at no point do you have to shave with a blade that you don't like quite as much. I'd imagine there's 7 because it makes it simpler to keep your rotation straight. All you have to remember is what day it is.

Come to think of it, how about a 31 blade set with a day of the month marked on each .