Here my argument, if we did lock the door it might be worse.
Guys coming in having no clue, if one thing we can do is raise the standards and teach these new guys fundamentals.
This way your not bidding agaist the guy trying to find this out only to heading down the path of being out of his retirement money. When they go broke he learns he needed to charge more, resulting in your jobs during this time period lost because customers didnt know any better either. Yes you may fix or repair some of his work for some and others will be stuck with messed up decks. These customers may just decide to go another route from the bad experience.
FOOd for thought.