That's the deal right there, often Cryoing something properly heat treated has an "academic" level of improvement, aka one so small that for all practical purposes it's pointless. However in a high competition, nearly no limit budget application, it becomes a matter of "If we didn't do it and we lose there was always SOMETHING more we could do"
Razors? Simple.. "We need something to set us apart. We cryo our parts!" Does it help maybe, marginally, but it might sell more. And if they can justify to the consumer that it's worth the extra cost then it is worth the extra cost to the company.
A good example of this is Hart barrels one of the leading barrel makers out there "
Cryo-treating steel has been in practice for many years to reduce stress in metal, and is very effective in some metals. The Crucible Specialties , Inc. 416R stainless steel we use to manufacture barrels is virtually unaffected by cryo-treating. Crucible's metallurgist have advised us that cryo-treating has no effect on 416R stainless steel. We have also independently tested several barrels and have been unable to detect any difference in the steel. We offer this service, as several of our customers believe in it and feel it gives them a competitive edge. The final choice is yours as to whether you feel this service is necessary.
As you can see, in their case they offer the service, but flatly state they don't find much of a difference in doing it.
In my experience with rifle barrels and cryo'ed barrels. In SOME cases you can lap a barrel to a smoother finish with a cryo'ed barrel. Personally I would much rather spend the money truing the action, or going to a larger contour and fluting the barrel. A bit off topic but just my general experiences.