yes it seems like a magic bullet, especially if you ski on a Lange or a Rossi that has removable soles. i have used the cantology wedges and they are a good product. we will be adding these cant strips to our business this season and at times they will be the method of choice.
for solid soled boots, it is not nirvana. you still need a jointer to true up the sole before you even assess for static cant measurements. if you have to true up the bottom of the boot, then you need a belt grinder to re-true your toe and heel spring. then you still need to invest in lift plates as well as the cost of the cantology plates. thats double the cost to the shop, so guess what, that will mean double the cost to the end user. putting a cant shim under the lift plate is not new technology. this process has been used for years by the factory reps and qualified boot guys. it is a great tool when changing cant angles after a boot has already been done. it works because when you add any more height to a boot that has already been canted with cant material, or slices of cut up hotel keys, etc, you can then nip the toe, and heel height back to square and the DIN height and off you go. although for FIS athletes the boot height still has to be 43mm max height.
i do have to correct your statement that using cant wedges takes less time. it takes more steps and and is actually a bigger project then using a jointer and then plating the sole. the accuracy in either method is only as good as the person doing the work. agree that it is expensive, and if done well usually time consuming.
the cant wedges serve a purpose for helping to get shops that do not currently have the knowledge or tooling to be able to do cant work. they simply need to invest in the cant wedges and a plunge router and they are off to the races. i will say that without the other tools like a jointer and a belt sander with an angle guide, the quality of the work will be suspect at best.
part of why this whole canting thing remains so high priced is the knowledge that goes into the whole process, and the responsibility that the shop is taking on to do that work. as a business owner that takes pride in the quality of product that we deliver, i am all in favor of home spun work and fly by boot canting by unqualified shops. this will only increase the value of our process, and our tooling.
there are plenty of places in our area to get bad cant work done. we fix/alter cant work done by our competitors locally, regional race reps, and european factories. we charge $195.00 to get your boot sole trued, alignment assessed, plane the angle into your boot or use cant plates between the lifter and the boot, lift the sole to required height, plunge router the top of the boot sole, and deliver a product that is accurate and performs well in your bindings. we also advise all of our clients to purchase and use cat tracks to preserve the integrity of the boot sole.
value of service is in the eye of the beholder. if you can find a better way to get those services for less money, what argument could possibly be made? it is a free market.