The formulae is as follows:
Ridiculously great and targetted custom audience + Ridiculously triggering Ad + CPM = 10-20cent and lower clicks all day.
Learn to use the api or build the custom audience with software for such or your followers/lists and use a great designer for the ads, followed up with a copywriter that does well on triggering words. Do at least 5 ads, more the better to a/b test, whichever performs the best run as you test another split test. Retarget and recycle the list. Boom you've got an active cheap traffic channel of people you can monetize with. Regards.