I made a website 3 years back, after analyzing a similar website on flippa which was making 2k per month. I didn't know that it has a lot of competition and lot of people are targeting same keywords, however, i was still able to rank 4th position for the secondary keyword but CPC and CTR were extremely low, with 250-400 per day traffic I was getting 2-3 clicks with CPC of 0.02.
I invested a lot of time, effort and $500 in that project but it was not worth it. I finally removed all the content as it was not worth to have that much of traffic on shared hosting.