Thanks Mark. Is it possible its just that the horses who are in the price range whence the majority of winners come are consistently quoted over the odds by the newspaper markets? It is a very common experience on reading these odds to think , "If only, in your dreams etc."
Would need to compare horses in the PP market line by line eg see how all PP 5/2 chances fare after opening above and below this quote etc.
Still, interesting that it acted as an effective filter on Testa's bets above, albeit on this very small sample.