If they were constantly ripping customers off, as I think you are saying and the fact they are always full is more than likely due to their quality of workmanship at a repectable price. Asides that if they were ripping that amount of customers off surely by now word would have got. I also think most like to show they are sucessful, therefore a mechanic would most likely choose a nice car. I’m not saying some businesses won’t rip you off but the majority don’t if they value their reputation. The other option is take a car to a main dealer and totally get screwed for parts. Strange how I quoted @wmcforum and it showed up as quoting @mitch
Main dealers are the only garages that can consistently provide poor service and still survive.