Matt, WHO SAYS, a point is a point or a point of a point? Where is that written in stone? What government agency specifies that every bottle of booster has to comply with your, or Chas' view of what equals a point?
I have seen studies that specifically show that some booster's claim a full point and do in fact mean that to be 0.1. There is no law that governs, nor is there even a consensus within the industry as to common standards of testing an octane booster. Every single study will vary the methodology used and consequently the end results.
Every booster product on the market, world wide, makes wild claims as to what a consumer can expect from their product. Every. Single. One. Not that they, or the mortgage companies would ever lie to the consumer. No need, they just use "fuzzy math" to keep you in the dark, all perfectly legal that way.