When I first started consulting, I had an idea of specializing in automating business processes. It was something I had done before, and I really enjoyed it. However I ran into the problem of those that understood the potential had already employed a few full time devs, and those that didn't, also did not understand the potential. I reasoned that people who needed automation were hiring tons of people. So I searched job ads that looked close to what I thought an ideal customer might be as a way to generate leads.
It turned out to be a fairly low quality way to find leads. Random cold calling would have probably netted me the same conversion rate.