This is a nice theory. And it could be true, and it does happen, but it's more than likely not.
You must be using better M&A brokerages/bankers than I ever have. None of them do actual diligence, they are selling the business...They are actively making the business look different to what it is. They certainly don't take on any risk (they are not a party to the agreement in any way) and they certainly don't obviate the need to use and pay a lawyer (and most small deals are each person pays their own costs).
With respect, are you actually buying businesses? Or just doing contracted technical DD? It feels like you are missing a good chunk of the picture here. The default take on the value of this business by a lot of folks buying businesses is going to be "close to zero". I mean, to be fair, I have not ever bought a hardware business so I'm a little out of my depth here... but.. not miles out.