Interesting stuff mate
I've often thought a lay of the two main national rags in England (The Sun and The Mirror) would be a good idea because no matter how good or bad the horses are, the fact that your "working class" punter is going to be skewed towards backing them is bound to drive the price lower than it should be and therefore present value.
I've never tried it though.
I might give it a go Cheltenham week but the downside is that two decen priced winners could wipe out the entire week's profit at festival prices.