The smartest know that dialog, discussion, and cooperation, can bring about a sum of possibilities that will easily dwarf any small-minded collection of tactics. By taking part, your part is enlarged.
in the scientific community results are top secret until published. Scientists are smart people working for the greater good, but they are fiercely competitive and don't risk giving their immediate peers any advantage.
Sounds good on paper, possibly disastrous in practice.
The smartest share what they know all the time -- that's part of what makes them smart.
marketing is different, marketing channels only remain good for a relatively short time period and sharing the knowledge around only hastens its demise. (oops, with marketing I mean growth hacking obviously)