The problem with this is that the overhead checking to make sure someone meets the requirement make it not worth it.
I have tried in the past to come up with ideas to help you guys promote your business. I can put database applications together very fast, but if no one is going to use them, what's the use? This is why other sites that have had this idea in the past have failed.
IMHO, marketing yourself as a "detailer" or a "paint correction specialist" is all wrong. These are job titles, not products. If you guys want results, don't worry about the guys who muddies the water with hack jobs. You can't change that. What you can change is how you market your own service so people understand the difference between what "they do" and what you offer.
In this regard. Facebook is a great tool to get the word out and let your loyal customers toot your horn for you.