IArmstrong,

I have encountered that same piece of wisdom myself, but it is a half truth, not the entire truth. It is good to own a razor for each day of the week, but it is not a necessity.

I have read somewhere that in reality, you only need to "rest" your razor overnight or approx. 24 hrs. to achieve a close shave with it the next day. Of course if you want to purchase an additional razor or two to insure that the blade will be completely recovered from the previous shave, by all means feel free to do so.