Also, @Drew Sygit has to say "you get what you pay for", because that's the only defense for over-charging for services.  

Now I have a working knowledge of what it takes to do any renovations in future investments, which helps in knowing if a contractor is overcharging for work.

They could come back later and try to over charge or even charge twice by mistake.

they over charged, did terrible repairs, charged me for the previous owners expenses,  etc etc etc. 

Now I have to hire a company to overcharge me? 

Now I have to hire out a company to overcharge me for work I know I can do?

My wife wants to remodel parts of our home and got talking to a friend of a friend, who is an interior designer. We have a nice home, relativley new, but some of the interior was already chosen by our builder when we ...

A couple of months later - due to a number of other issues between us - I switched to a new PM.Of note here is that the old PM actually wanted to end the relationship with me: besides my pointing out general negligence concerns in the month leading up to that, I also began to ask for any/all contractor invoices to be forwarded to me, as I started to suspect issues with being overcharged for repairs.

I used "really good" PMs and yet they could not fill vacancies, they over charged for stuff and used terrible subs that overcharged.

Most purveyors of LLC's set them up (and in the case of people out of Nevada or Utah, tend to grossly overcharge for lots of needless moving parts) and do a terrible job of teaching people how to well & truly maintain them.