That a driver (who already owned a car) had to pay 2x the price of an average house (which is already overpriced) to do the job isn't a secondary effect. Its a primary effect and drives up price and down the driver's pay. That that happened is a 10000ft giant red sign pointing out that it didn't work. That you can't understand that means that you fundamentally don't understand good public policy in any way. Anytime a policy creates such an outcome, that system needs to be scraped and a new one needs to be created because its rotten to the core.