You'd be doing way more harm than good. The battle between ad networks and unscrupulous website owners using bots to fake ad clicks has been going on forever.
I don't think the question was about whether this would actually help the advertisers. (I suspect it was rhetorical.) Of course the defense will now be harder to execute for anyone who reads this thread.
You'd be doing way more harm than good. The battle between ad networks and unscrupulous website owners using bots to fake ad clicks has been going on forever.