As a complete tangent:


The razor blades I buy are about 15¢ a piece, which is probably what we would consider "normal" markup on any product.

More "modern" razor blades tend to be about $1 a piece, for the "people still use those?" model, to over $3 a piece, for the "Fuck it. We're going to five blades" model. There's no way that this isn't an enormous markup.

The original razor blade model was "incorporate replaceable wear parts to create a continuous demand". The new model is "try to lock people into buying ridiculously overpriced disposables". I prefer to think of that as the inkjet model, despite the fact that razor manufacturers were doing it earlier.