when diy`ers have a go themselves, it serves them right when they cock things up and it costs them double in the end. when they snap bolts or round them off or loose things and then ask us to fix them afterwards, they still lie to us about what they have done themselves to save face, and that all makes our job that much harder.
not to mention that in this day and age, we all spend a lot of time scratching our heads and we are supposed to be the experts (well i do anyway)