but normally at that point, the seller
becomes more motivated so if problems are found, a formerly firm price
becomes amazingly negotiable (unless the seller is a complete idiot).

snicker, snicker, snicker. so the broker wants the chiseling buyer -- whom he
despises as an incompetent turd trying to steal something -- to believe. screw
with a broker and he/she will screw you back. and he/she has seen every
screwer type on the planet. It ain't an even match. And it shouldn't be even.
That is the service a broker offers to a seller. Insulation from the
sniveling fools trying to steal.