B2B SaaS founder here. I had exactly the same experience. I built my own code for tracking signups, and discovered that the actual conversions were a big fat zero. That's when I stopped burning money on LinkedIn ads.
Mind you, this experience wasn't much different for other ad networks. Quora was slightly better in that at least there seemed to be some interest shown by people landing (or perhaps this was the only ad site that sent actual people my way?).
Mind you, this experience wasn't much different for other ad networks. Quora was slightly better in that at least there seemed to be some interest shown by people landing (or perhaps this was the only ad site that sent actual people my way?).