Not even gonna read it all but yes home electrics have been subject to this for years so the answer to your question is it will never stop.
Sadly you can blame greed of previous generations on why people won't pay to have electrical work done that realistically is not difficult,wiring lights and sockets is simple let's be honest and like anything else in life there are plenty of so called "professionals" out there charging the earth (no pun intended) and doing poor work.
Too many horror stories of overcharging and scaremongering have left the domestic industry in the mess it is now,becoming a "spark" after 5 weeks doesn't help either,send one of those boys into my environment and they'll be gone the first time you mention "3 phase".
It needs sorting from the top down,legislation needs to be right and proper as in electrical goods can only be purchased upon reciept of a valid JIB card or such like.
A good point was made earlier though,fixing your own cars brakes,plumbing in a tap,knocking down a wall,chainsawing a tree,is wiring up a socket so different?
I wouldn't pay for any of the above jobs,I've repaired my own boiler a few times and guess what,no one died.
It's a tough game to prove the domestic industries shed it's conman image,I don't envy you boys at all.