I would sell it/give it for free if this method, used by others, makes me generate more.
I explain better: I used to create adult websites and monetize it with specific video and banner networks, which get several impressions thanks to traffic purchased in other specific networks. At the time this gave me very positive ROI, but I couldn't invest much in traffic.
So, I provided guides about how to create this kind of site, which network to use for monetization and traffic purchase, but I included in my guides my referral links for all of these tools. Hosting, premium scripts, ad network etc... all of them presented with my referral links, so for me it was ok to "give away" my winning strategy, as long as I could get a % from other's earnings.