A scam! Them is fightin' words.
Firstly, a good definition of a management consultant is "someone who borrows your watch and then charges to tell you the time". Now that IS a scam. By the way, this is meant to be light-hearted - you did call my whole career "a scam".
Secondly, all industries have a range of costs. It's like saying that coffee shops are a scam 'cos only 20c goes on the coffee - the rest is wasted on cups, coffee machines, staff, tax, advertising etc. In the same way, you've gotta have underwriters to take on the risk, claims staff etc etc.
Brokers act for the client NOT the insurer. If you don't like their remuneration, take it up with them or go direct. There are brokers or intermediaries in a wide range of industries - what is a supermarket, chandler or boat broker?
There's a good chunk of tax - take that up with the government.
I'm assuming that you accept that all commercial businesses need to make a profit and provide a return to shareholders in exchange for providing capital. I'm sure your management consultancy built in a nice profit margin (which is of course quite right - we allwant to earn a dollar )
Cheers
Bristol
P.s. self insurance is great in theory - until you sink that $2million boat