As an IT-worker, it’s not uncommon to test technology and scrap it due to bad results or unfit implementation. Usually this isn’t considered a waste, since there are a lot of things to learn in the process.
However, this one system which was designed for testing applications was a bit different. From the day we were told about it, basically every developer knew that this would be unfit. However the customers were firm on that it should be implemented. I’m not sure if it was because of the looks of the sales person or if it was a genuine incompetense that the decission was landed, but I felt a bit too junior to stand up against it. So about a month of work with 2 developers went down on something that every other developer knew would be scrapped. 2 devs at ~$100/hour, 4 weeks of 40 hours, so roughly $32,000.
The lesson was that I need to be more direct and firm when things like that is decided.