Kind of something I have wondered about (speaking of mind games). What if you went into business as a plumber or electrician. But each house you went to, you just screwed up things more, and then left. (I take it you all have seen the Three Stooges clips.) Alright, admittedly you couldn't be licensed and bonded by the state, if you did that. But where I live, that often isn't an issue either apparently. How long could you stay in business that way? And how much money could you ultimately make? Keep in mind I am not suggesting anyone actually do this. Well?
If you were licensed as a plumber or an electrician by a state board---you could not fuck up much, because a mistake in those professions would be apparent immediately and would not / could not be certified as completed work. These trades are monitored closely for good reason. Now when it comes to roofing----that's an entirely different matter, unfortunately. I know of a company that just keeps plugging along doing shit work for 40 years! I have pictures of work they've done for my amusement. Owner was caught taking a crap on a ladys roof! Not to mention the unlicensed guys running around, which will most likely never return to fix a screw-up. They've been paid soooo--adios, sucker! NEVER--EVER-- pay more than is legal-which in the states I've worked , is 10%--up front! Get references, check with the contractors board in your state. To spend thousands of dollars on what I consider the most important part of your house should not be taken lightly. (If anyone is contemplating a roof job soon, I can recommend a rubberized comp shingle that is excellent. Mind you--I make nothing on a recommendation.)
Believe it or not--the guy to which I refer burnt a house part way down by going off to lunch and leaving a torch-down torch running. Another roofer in the same town burnt down a HUGE, really fancy furniture store. He had a million dollars insurance, but replacement cost 2 million. He's out o' business.