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Probably marketing.
Can you imagine an average guy having seven different Gillette disposable razors? :) But when you buy refill cartridges they come in a case of five or ten. I don't think our...

Just to mix it up, here's my no water/James Bond shave:

Hot shower
Rinse the brush, shake most out
Lather a puck of soap
Apply to dry face
2.75 passes
A little witch hazel
Put away razor...