Drive Surgeon, you talk of 'probably' and 'bet' what people are and aren't doing. Well why don't you find out what the 'facts' are, before your own imagination drives you to any early heart attack? You could well be right, but the point is, you don't actually know. Look back at what you've written; if you take out all the stuff you don't actually 'know' about, then you're left with very little. You are making it worse for yourself. It makes me sad (fact) to see people winding themselves up.
But please, also consider this; whatever you think about the people you are refering to, they are ultimatly supplying a demand if it is that they are getting the work. So, instead of laying the blame for the (percieved) poor workmanship soley at the feet of the people doing it, why not attribute some blame to the people who are paying for it? They are the ones who are fueling the situation.