Recent experience: called a HVAC contractor to fix a heating furnace, they spent 1 hour convincing us to scrap the current furnace and install a new one; once we told him "no" at least 10 times, he spent 30 minutes "diagnosing" the problem while on the phone with somebody with technical knowledge; then he quoted $250 to replace a part that I could buy on Ebay for $15. Finally, I bought the part and replaced it myself.

Sounds like sociopaths being allowed to do sociopath things problem, rather than supply and demand problem.