Back in the day when you had crazy amounts of money you would have a seven day set, because you did not maintain your own razors, you had staff for that, so every week a member of your house star would make sure that your razors were stropped and touched up if needed and all you had to worry about is shaving, unless you had even more money in which case someone did that for you every day too. It's kind of like maintaining your other items in life. How many very wealthy people every change their own oil? If you are crazy rich you don't park either or in some cases ever drive.