Working with the silicon valley for ten years now I have seen every "imaginary" margin known become internal compliance regulation; companies with money usually go for about 6db and those who dont will sell even a failing product knowing the chances of capture are low to nil in most cases. As a laboratory we view the situation as "the limit is the limit and the limit is the law". If your under your legal to fly.
Jason Chesley C&C Laboratory, Inc. ps I have seen a spec or two that favors a certian margin due to the manufacturing error factor.
