what the fuck is a PPC network?

Are you talking about A*dsense on your website?

The question still doesn't make any sense. PPC means pay per click. Cookies have nothing to do with pay per click through the search engines; the search engines don't give a shit about your cookies (well, they do, but not the cookies set by affiliate networks).

So, give us the scenario. Exactly what cookie would you like to stuff? Exactly how does it relate to PPC?