What is the point?

 My little foray into posting an ad featuring more than one title didn't go to well.

At the beginning of February I added two titles and posted the ad. I only saw clicks on one title, not both. In  a few short days - nine, to be precise, I watched the clicks rise into the 90's but not one click proceeded to a sale. Meanwhile I had spent almost thirty dollars. This did not look good. If I had been selling copies I might have continued, but as it was, I ended the ad. 

I must admit to wondering if the algorithm is set up to make money for Amazon rather than me! 

Has anyone else tried this new way of doing an ad? I'm wondering if I mishandled it or something bit I have to say I am not going to keep spending on clicks if no one buys. What's the point?