I release numbers and have had my businesses cloned, extensively. That isn't a terribly large competitive threat -- if you can't totally paste someone trying to knock off your hairbrained strategy from 12 months ago, what are you doing in this industry?
If I was to argue for keeping numbers secret, and you'll notice I'm kinda circumspect with regards to certain ones, it might be because you have multiple audiences. Numbers everyone knows are boring to some audiences. Secret numbers, though, secret numbers are a very valuable currency.
At first I thought it was an eggcorn (look it up), but it turns out that both hairbrained and harebrained have long histories, so if it is an eggcorn, it is an old one.
If I was to argue for keeping numbers secret, and you'll notice I'm kinda circumspect with regards to certain ones, it might be because you have multiple audiences. Numbers everyone knows are boring to some audiences. Secret numbers, though, secret numbers are a very valuable currency.