4 years worth? I thought the straight users said it was cheaper in the long run than DE's ?
Buying hones is your last hardware purchase for the life of the razor - decades. Buying Feather DE blades in 200 packs, at $70 (mensbiz) and using a blade for three shaves - $550 gets you 13 years worth. So on that rough calculation, straight razor shaving is cheaper, it just takes 13 years to break even.