A small household crisis, like a faulty pipe or a leaky roof is likely to hit everyone at some point, and when it does someone profit from it.
The Crooked Contractor comes in two flavors, the Criminally Lazy and the Plain Criminal. The criminally lazy is paid an hourly wage, shows up late — if at all — and doesn't exactly rush the job. The plain criminal flavor includes scammers who e.g. "inspect [...] [tvtropes.org]