I was required to attend a monthly power engineering group for a sales position I once held. A company came in and made a presentation on solar farms. (They built them.) During the show I noticed the repair costs were not included in a roi projection. Also the same roi projection showed a major loss if the government well ran dry. When I asked about these two issues they looked at me like I was about to take a beating. I was surprised no one else in the room caught it as I was the only one with no college degree there. After that meeting I made a ton of new contacts and future sales.