I hear what you say, but I think you missed the point maybe ? I for one can't handle every customer, I'm busy enough !! :-)) What It's about more than anything, is presenting yourself in a way where the average customer can independently assess your standards, ability and what you can offer, instead of the usual sceptical 'trust' format. This is the same format that often renders many vastly qualified and experienced techs 'only as good as their last job'. The trade has such a bad name, we only get one chance !
A single, respected publicly known icon like RAC or AA would do the job, instead of all these abbreviated faceless schemes that even us in the trade don't even know enough about, so what chance do the public have.
The trade needs this, it needs to kick the backstreet image into orbit and we can't do it alone.