To ellaborate? on my previous post as agreed by partypooper(at least for the first point anyway)...

If you bet level stakes on a horse showing the same price, every race you would average about an 85-90% return on the tab..
If you bet on every horse in the race on the tab and outlayed $100 you would return $86 (at the price when you bet, not allowing for shortening divs...).
To me this suggests that we as punters as a combined entity, are able to give each horse in a race an accurate(reasonably) chance of winning.
If this is the case, a horse that starts at $2 on the tab actually represents $2.35 value meaning that if you can get $2.36 or better you have an edge.

Presuming all this, one must get a reasonably accurate figure of the end price of a horse on the tab. You cannot do this by watching the tab market. I find that a certain fixed odds company, let's be dyslexic and call them isa, provides a reasonably accurate depiction of the favourites end price on the tab. Some races it is obvious that they are prepared to risk a horse so occasionly this is not the case but it gives you a pretty good idea.

This is certainly not a certainty by any means, but if you can get about 25% better div than the tab then you should not lose your money quickly (provided that the results come in as expected) and I think that this would give you a better advantage than leaving out some races.

I would suggest from what I have seen, that you can get this sort of value on about ~25-35% of races providing about 10 or more betting opportunities on wed-sun racing per day, if you bet in the right places...

Loose ends...
When I say tab, I am always referring to the home state tab.
Maybe you can only get this value because there is late money coming for other horses, hence reducing the favs chances? (I have no real opinion about late money.)

Question: If I am right about the tabs market share representing the horses chance, what difference would the type of race make? Do we suddenly lose our abilities when a maiden race occurs?
All horses have ran before, whether it be in a race or a trial.

Sorry everybody, but I am really bored and have nothing better to do.....