Hope I'm not telling me Granny how to blow eggs here, but pre-post prices and "ANTI - POST prices are 2 different things.

Anti-post is literally the market formed by a particular bookmaker on an "all in basis" often days or weeks before the race, so yes if you take the price and the nag is withdrawn you have done your dough!

Whereas pre-post prices, or as we say in the uk (forcast prices) is indeed someone's opinion of the likely SP, though they would have to be pretty well informed I guess.

You are able to bet here at top fluctuation with a stipulated minimum price with IAS as well as others, so let's say you wanted a $100 on Makavi Diva today at top fluc (minimum $4 , as per WA TAB-FORM)

Your bet was on at $4.60c so you collect.

However if the the top fluc had been say $3.90 your bet would have been OFF, even though it won.

Hope this helps!!