What is the reliability of pre post markets? who puts their name to the odds posted so early?

Put it this way the odds are shown in the paper aren't put up by a bookie who when lists these odds wont have the worry about the phone answering with a punter wanting to take the odds on offer. Its really a market based upon, what is most likely 1 or 2 peoples opinions.
Wouldnt there be more confidence in taking note of live flucs or opening price straight from the ring where the persons posting are legit.
Money speaks all languages and the difference between a newspaper editor slash market supplier is no where near what a large gathering of bookies and pro punter are willing to do with the market?
i often find the newspaper listed odds midweek anyway are way off what you find 5min before the race. Saturday odds supplied by tab fixed price are as close as you'll ever get.....and even then.........