Xanadu
You have a valid point with regard to a horses weight and blood count goes,but I have to disagree with you about the rest of your assessments.Sorry if I offend you as I am new here.
1)the betting public does not provide the "generous prizemoney"only a percentage of same.The betting public makes Governments,Tote operators and bookmakers wealthy.
2)The only owners that live this luxurious and comfortable lifestyle that you talk about do not need to rely on a horse/s to provide them with same,they are already wealthy and living same.I am talking the Santics,Inghams,Sheiks etc.
Most owners these days are in syndicates and are battlers like you and me,hoping like hell that they have bought into a good one.Anyone that can afford to put a horse with Freedman,Hawkes or Waterhouse is not a battler.
3)When a horse accepts for a race,it does not become public property as you wrongly claim.Sure,it's racing in the public arena,but unless you are an owner/part owner and are footing the bills associated it is not your property in any way,shape or form.It is entirely up to you wether you even watch it race,let alone bet on it.
4)IMO as an owner/part owner,you are entitled to "first go"as you put it.As a battler you've got to get a quid where you can get it.I mean like if you owned or part owned a nag that the trainer told you he/she thought was "right"on a given day and it was at 10/1,would you approach the course commentator and ask him to announce it to the betting public?I think not,you would play your cards close to your chest,and if you didn't the trainer would never inform you again.
5)As for tactics,well that is already public knowledge,so don't know where you are coming from there.Trainers are now compelled to inform stewards of any change in riding tactics.Gai Waterhouse copped a fine not long ago for not doing same.
6)If you do your homework you can easily identify the leading trainers methods or tactics,for instance Hawkes will take a lot of non Sydney winners to QLD where they will invariably win races.John Morrissey does it quit often too.Look at yesterday with Morrissey and Perette(I had a good win on it)it's won 3 from 4 at Eagle Farm over 1400 yet still paid over $9!!!!That info was PUBLICLY available.

You will never get access to all the info you are seeking.
Could you imagine the course commentator 30 minutes before the Melbourne Cup this year announcing"Ladies & Gentlemen of the betting public,the chairman of stewards has just informed me that Maykbe Diva has bumped her head in the stalls about an hour ago,has a runny nose and is on heat,so she will be racing with a sore head and a cold and all the males will stay behind her.Also they informed me that Glen Boss is in a foul mood because the missus knocked him back last night and he can't win big races unless he has sex the night before.He also has a migraine,but informs us he will be OK as he has just taken 8 panadol fortes.
Would you have still bet on her????

As I said in the beginning,please don't take offence,but there is just so much info already available these days,I just think you are asking for something you are never going to get,and as Gazman said,what would the bookies do with same???They already have access to more info than you or I will ever have,let's not give them any more!!!

Sorry this has been such a long post,youre probably all nodding off by now!!!