Because there's nothing like an adrenaline rush fresh out of the shower?

In all seriousness, it's because I get less irritation and a closer shave combined with the fact I can use the same ~100 year old blade (well, in theory anyway... when I don't have a bout of RAD going on) for the next 100 years and get as close of a shave the last time I use it as I did the first time.