Well the worry is that you spend more money on a part that turns out to be unusable, so you end up with no device and less money.
[1] https://www.inquirer.com/business/toyota-prius-catalytic-con...
[2] https://www.msn.com/en-us/autos/news/thieves-target-toyota-p...!
[3] https://www.theguardian.com/money/2020/feb/01/catalytic-conv...
> The thieves make about £300 to £500 from every converter stolen, fenced through scrap metal dealers, with car manufacturers warning that a gap in the Scrap Metal Dealers Act 2013 enables dodgy dealers to buy them without checks required on where they came from.
They are making money by selling the platinum inside.