Beg to differ CP. Take the latest file 28 April to 4 May. If you filter out IP In Play and PE Pre Event, that only leaves NI ?? Not sure what that means, but doesn't matter, take a typical race at random Wyong R1 1/05/14.
If you filter PE and IP OUT, leaves you with NO horses! That's because NI was only applicable for TO BE PLACED on that event.


Another example: 28/4/14 Bathurst R1 Pace runner Amelia Regal Last Taken actually three prices at 3:39..... 50 60 100. How do you know which figure relates to what price classification. This is a simplistic example but the favourite in the race would have lot's of differing numbers displayed.
The prices, that Betfair paid on, were Back 50, SP 81.83 & Lay 110.

That's really accurate, hey? Build a database, don't think so?

Then what are the prices published representing, they're not WAP, SP, Back or Lay. A punter needs some reference to what he has available to him on screen and them providing last price taken is of no consequence. Let's say I wanted to query the file to find the largest price never to had a win. Well I can tell you the figures provided are so far off and bear no resemblance to actual SP.