ok since no one has answered I guess there are no statistics/figures out there. Anyway here are some interesting figures :

The statistics for 2004/2005 were as follows :

31037 Horses were Raced
9763 Won nothing ( 31% )
13715 Won between $1- $9999 ( 44% )
7052 Won between $10,000 - $99,999 ( 22% )
466 Won $100,000 - $499,999 ( 1% )
41 Won more than $500,000 ( < 1% )

What these figures indicate to me is that sydnicates or partnerships would have a very hard time covering the costs with prize money.

I might look into this a bit more but if anyone has an opinion or has been in a syndicate before please post some comments.

Good Luck.