First, if you're going for the razor-blade model, your razors need to be cheap. Second, if you're the only place where customers can buy blades, your market wil

First, if you're going for the razor-blade model, your razors need to be cheap. Second, if you're the only place where customers can buy blades, your market will be more limited than one where your blades are the best, but you have blade competitors.