Wouldn't it be more likely for the reverse to hold true? The razor-and-blades business model doesn't exactly apply here given the low level of technical sophistication required to print the calibration stickers. Constructing inkjet cartridges and machining modern razor blades are far more complex feats of engineering.
As the paper describes, the stickers can be applied "in any pattern so long as some tape is visible from every position that the device will move to". Thus, there is no need to align the stickers in a special pattern beforehand.
Anyone should be able to print similar calibration stickers on their own dime.
But then you might want to use it with lets say glossy plain-coloured melamine sheets - most surface trackers have a lot of problems with this, so the calibration stickers are a cheap and reliable solution.
The only issue I can see is kick-back from the router bit, especially if you use larger diameter bits - this can throw the router significantly, and unless the control system compensates quickly yet gently, you may well lose tracking, leading to undefined results.
As the paper describes, the stickers can be applied "in any pattern so long as some tape is visible from every position that the device will move to". Thus, there is no need to align the stickers in a special pattern beforehand.
Anyone should be able to print similar calibration stickers on their own dime.