I think it's smart to have it disclosed somewhere (FAQ) because people that know what affiliate links look like can figure it out themselves anyway by looking at the links.
1. Add a click handler to your anchor tags that redirects to an affiliate-linked version of the href. 2. Modify the url on mousedown (since it happens before click.) I think someone told me this doesn't actually work, but I don't remember for sure.
Camouflage doesn't render a soldier invisible but that doesn't mean it's not effective.